Virtual variable decentralization
Publish: 2021-03-31 02:10:34
1.
According to the data types of independent variables and regulatory variables, it can be divided into the following four situations:
< / UL > 0
2. What is computer network? The application of computer network can be divided into: (1) circuit switching, message switching, packet switching and mixed switching according to the switching function of network
(2) according to the topological structure of the network: bus structure, star structure, ring structure, cellular structure (it is proced with the emergence of wireless communication technology)
(3) according to the scope of action: local area network (LAN), wide area network (WAN), metropolitan area network
the most successful and recognized first remote computer network in the world was in 1969. Before the mid-1960s, the first generation computer network was a remote online system centered on a single computer. A typical application is an aircraft booking system composed of a computer and more than 2000 terminals across the United States. Later, the second generation computer network was connected by multiple hosts through communication lines to provide services for users, which rose in the late 1960s; With the rapid development of the third generation computer network from the late 1970s to the 1990s, two most important architectures, namely TCP / IP architecture and OSI architecture of the international organization for standardization, came into being
features:
1. Strong timeliness
2. Wide communication area
3. Multimedia information
4. Hyperlinks breaking through linear restrictions
5. Increasing interactivity
6. Flexible communication forms
the biggest feature is the interactivity of network communication
network communication protocol is the specification of information transmission and management in the network (including the Internet). Common protocols are: TCP / IP protocol, IPX / SPX protocol, NetBEUI protocol, etc. IPX / SPX is widely used in LAN. If users access the Internet, they must add TCP / IP protocol to the network protocol. TCP mainly refers to transmission control protocol, while IP protocol refers to internet protocol
2 describe the basic composition of computer network (hardware and software)
server, workstation, communication equipment and transmission medium
3. What is the topology of computer network? How many common topologies are there
the physical connection form of a computer network is called the physical topology of the network
1. Bus topology
2. Star topology
3. Ring topology
4. Tree topology
4. What is computer network protocol
computer network protocol: network protocol is the rule of communication between computers. In order to effectively communicate between computers in different places and with different operating systems, there must be a communication method that can be recognized by all kinds of computers. The information expressed by any party can be recognized by other parties. Therefore, it is necessary to specify a standard: network agreement. Just like the teacher must use Putonghua in order to make everyone understand. The most commonly used protocols are TCP / IP protocol
name the OSI 7 layer protocol
the first layer is the physical layer
the second layer is the data link layer
the third layer is the network layer
the fourth layer is the transport layer for processing information
the fifth layer is the session layer
the sixth layer is the presentation layer
the seventh layer is "everything". Layer 7 is also called "application layer
5. What is the standard network protocol used by Internet
TCP / IP
6. What are the advantages of adopting client / Server Mode in network application
(1) resource sharing can be realized. The resources in C / l structure are distributed, and there is a one to many relationship and running environment between client and server. Users can not only access the resources on the server and local workstation, but also enjoy the resources on other workstations< (2) scientific and professional management can be realized. The resources in the system are distributed on each server and workstation, and the combination of hierarchical management and professional management can be adopted. Users have the right to make full use of the professional knowledge of their own departments and fields to participate in the management, making the management at all levels more scientific and professional< (3) it can process information quickly. Because of the point-to-point running environment in C / S structure, when a task requests processing, the load of the task can be evenly distributed among all possible servers. In this way, the requests sent by the client can be processed by multiple servers in parallel, which provides extremely fast response speed and high transaction throughput for each request< (4) it can better protect the original resources. Because C / S is an open structure, it can effectively protect the original software and hardware resources. In the past, the data and software accumulated in other environments can be retained in C / s through integration, and can transparently access multiple heterogeneous data sources and freely select data application development tools from different manufacturers, which has a high degree of flexibility; The former hardware can still be used completely. When the hardware resources are added to the system, the capability of the system will not be weakened. At the same time, the client and server can be upgraded separately, so it has excellent scalability<
6 file transfer is mainly used to remotely transfer files from other computers to the computer to be applied
for example, pigeon transferring books, QQ transferring files, FTP uploading, etc.
remote login (rlogin) is a UNIX command, which allows authorized users to enter other UNIX machines in the network, just as users operate in the field. Once entering the host, the user can operate anything allowed by the host, such as reading files, editing files or deleting files&# 92;
what else do you want to ask? I don't have 200 points
(2) according to the topological structure of the network: bus structure, star structure, ring structure, cellular structure (it is proced with the emergence of wireless communication technology)
(3) according to the scope of action: local area network (LAN), wide area network (WAN), metropolitan area network
the most successful and recognized first remote computer network in the world was in 1969. Before the mid-1960s, the first generation computer network was a remote online system centered on a single computer. A typical application is an aircraft booking system composed of a computer and more than 2000 terminals across the United States. Later, the second generation computer network was connected by multiple hosts through communication lines to provide services for users, which rose in the late 1960s; With the rapid development of the third generation computer network from the late 1970s to the 1990s, two most important architectures, namely TCP / IP architecture and OSI architecture of the international organization for standardization, came into being
features:
1. Strong timeliness
2. Wide communication area
3. Multimedia information
4. Hyperlinks breaking through linear restrictions
5. Increasing interactivity
6. Flexible communication forms
the biggest feature is the interactivity of network communication
network communication protocol is the specification of information transmission and management in the network (including the Internet). Common protocols are: TCP / IP protocol, IPX / SPX protocol, NetBEUI protocol, etc. IPX / SPX is widely used in LAN. If users access the Internet, they must add TCP / IP protocol to the network protocol. TCP mainly refers to transmission control protocol, while IP protocol refers to internet protocol
2 describe the basic composition of computer network (hardware and software)
server, workstation, communication equipment and transmission medium
3. What is the topology of computer network? How many common topologies are there
the physical connection form of a computer network is called the physical topology of the network
1. Bus topology
2. Star topology
3. Ring topology
4. Tree topology
4. What is computer network protocol
computer network protocol: network protocol is the rule of communication between computers. In order to effectively communicate between computers in different places and with different operating systems, there must be a communication method that can be recognized by all kinds of computers. The information expressed by any party can be recognized by other parties. Therefore, it is necessary to specify a standard: network agreement. Just like the teacher must use Putonghua in order to make everyone understand. The most commonly used protocols are TCP / IP protocol
name the OSI 7 layer protocol
the first layer is the physical layer
the second layer is the data link layer
the third layer is the network layer
the fourth layer is the transport layer for processing information
the fifth layer is the session layer
the sixth layer is the presentation layer
the seventh layer is "everything". Layer 7 is also called "application layer
5. What is the standard network protocol used by Internet
TCP / IP
6. What are the advantages of adopting client / Server Mode in network application
(1) resource sharing can be realized. The resources in C / l structure are distributed, and there is a one to many relationship and running environment between client and server. Users can not only access the resources on the server and local workstation, but also enjoy the resources on other workstations< (2) scientific and professional management can be realized. The resources in the system are distributed on each server and workstation, and the combination of hierarchical management and professional management can be adopted. Users have the right to make full use of the professional knowledge of their own departments and fields to participate in the management, making the management at all levels more scientific and professional< (3) it can process information quickly. Because of the point-to-point running environment in C / S structure, when a task requests processing, the load of the task can be evenly distributed among all possible servers. In this way, the requests sent by the client can be processed by multiple servers in parallel, which provides extremely fast response speed and high transaction throughput for each request< (4) it can better protect the original resources. Because C / S is an open structure, it can effectively protect the original software and hardware resources. In the past, the data and software accumulated in other environments can be retained in C / s through integration, and can transparently access multiple heterogeneous data sources and freely select data application development tools from different manufacturers, which has a high degree of flexibility; The former hardware can still be used completely. When the hardware resources are added to the system, the capability of the system will not be weakened. At the same time, the client and server can be upgraded separately, so it has excellent scalability<
6 file transfer is mainly used to remotely transfer files from other computers to the computer to be applied
for example, pigeon transferring books, QQ transferring files, FTP uploading, etc.
remote login (rlogin) is a UNIX command, which allows authorized users to enter other UNIX machines in the network, just as users operate in the field. Once entering the host, the user can operate anything allowed by the host, such as reading files, editing files or deleting files&# 92;
what else do you want to ask? I don't have 200 points
3. Simulation questions of the final examination of principles of Statistics, And the symbol of unit quantity is \\\\
2. Any statistical distribution must satisfy___________ And_____________ There are two conditions
3. Sampling estimation is calculated by actual survey_____________ To estimate the corresponding______________ Numerical value
4_________ Variables, and independent variables are controllable___________ Variable
5_____________ And, uh, uh, uh, uh, uh, uh, uh, uh, uh< General survey is generally used to investigate the number of social and economic phenomena at a certain time point, and it does not exclude the investigation of items that belong to the period phenomenon
2. For the same population, the value of period index is directly proportional to the length of the period, and the value of time point index is inversely proportional to the interval of time points
3. In sampling inference, the total sum index value is definite and unique, while the sample index value is a random variable
4. The characteristics of sampling proportion are: the larger the sample proportion is, the larger the sampling average error is
5. In all kinds of dynamic series, the size of the index value is restricted by the length of the period reflected by the index< 3. Multiple choice questions (2 points for each sub question, (12 points in total)
1. The indivial things that constitute the statistical population are called ()
A. investigation unit B. mark value C. quality unit D. total unit
2. Compound grouping is ()
A. group two or more populations by using the same mark
B. group a complex mark for a population
C. group two or more populations for the same population Two or more markers should be selected for the same population and grouped in parallel
3. The total index should reflect the different time conditions, It is divided into ()
A. quantity index and quality index B. time index and time point index
C. total unit amount and total mark amount D. physical index and value index
4. The most common method and basic form of calculating average index is ()
A. median B. mode C. arithmetic mean D. harmonic mean
5, It can be divided into ()
A. total index and indivial index B. quantitative index and quality index
C. average index and average index D. comprehensive index and average index
6, ”The first and last half method is applicable to ()
A. calculate the sequence time average for time series; B. calculate the sequence time average for time series with equal interval; C. calculate the sequence time average for time series with unequal interval; D. calculate the sequence time average for dynamic series composed of two time series, (8 points in total)
1. Number of times distribution sequence ()
A. It is composed of two factors: the group divided by a certain mark and the number of units in each group Group limit and group median constitute
C. It includes quality distribution series and variable series
D. It can be expressed in the form of chart
e. it can prove the overall structure and distribution characteristics
2. The investigation unit is ()
a. the population to be investigated
B. the person in charge of the overall unit to be investigated
C. the undertaker of the investigation project
D. responsible for the report Unit of survey results
E. specific unit of survey objects
3. Sampling error in sampling estimation ()
A. is inevitable,
B. can be eliminated by improving survey methods,
C. can be calculated in advance,
D. can only be calculated after the end of the survey,
E. its size can be controlled />4. Suppose that the linear regression equation of unit cost (yuan) to output (100 pieces) is YC = 76-1.85x, which means ()
A. for every 100 pieces of output increased, the unit cost decreased by 1.85 yuan on average
B. for every 100 pieces of output decreased, The average unit cost decreased by 1.85 yuan
C. the output and unit cost changed in the opposite direction
D. the output and unit cost changed in the same direction
E. when the output was 200 pieces, the unit cost was 72.3 yuan
v. questions and answers (5 points for each sub question, 10 points in total)
1. Briefly describe the concept and function of variation index
2. What is the basic meaning and computer form of average index< The results of 40 students in a class are as follows:
57 89 49 84 86 87 75 72 68 75 82 97 81
67 81 54 79 87 95 76 71 60 90 65 76 72 70
86 85 89 89 64 57 83 81 78 87 72 61
school regulations: below 60 points is failure, 60-70 points is pass, 70-80 points is medium, 80-90 was good, 90-100
was excellent. Requirements:
(1) divide the class into five groups: fail, pass, medium, good and excellent, and work out a frequency distribution table
(2) indicate the grouping mark and type; Analyze the examination situation of the class
2. The proction situation of three workshops in a factory in the first quarter is as follows:
planned completion percentage of workshop, actual output (unit) and unit proct cost (RMB ＆ 92; RMB ×; According to the above data, we calculated: (1) the average planned completion percentage of the output of the three workshops in the first quarter.
(2) the average unit proct cost of the three workshops in the first quarter.
3, The unit is "Dan" 92; The linear regression equation between irrigation amount (expressed by X, unit is "inch") and irrigation amount (expressed by x) is YC = 2.82 + 1.56x. It is also known that the variance of variable x is 99.75 and that of variable y is 312.82
(2) calculate the average yield per mu when the irrigation amount increases by one inch
(3) calculate the correlation coefficient between irrigation amount and yield per mu, and analyze the degree and direction of correlation< 4. The unit cost of an enterprise's procts in 1988 is 2% lower than that in 1987, 5% lower than that in 1988, 3% lower than that in 1990, and 1.5% lower than that in 1990. Taking 1987 as the base period, this paper calculates the total and average rection rate of the unit cost of the enterprise from 1988 to 1991 It is required to write out the formula and calculation process, and keep four decimal places in the result.)
5 200 pieces were selected from a batch of parts for testing, of which 188 pieces were qualified
requirements: (1) calculate the average sampling error of the qualified rate of this batch of parts
(2) interval estimation of the qualified rate of this batch of parts is made according to 95.45% reliability (t = 2)< The unit cost of an enterprise's procts decreased by 2% in 1988 compared with 1987, 5% in 1989 compared with 1988, 3% in 1990 compared with 1989, and 1.5% in 1991 compared with 1990. Taking 1987 as the base period, this paper calculates the total and average decreasing speed of the unit cost of the enterprise from 1988 to 1991 It is required to write out the formula and calculation process, and keep four decimal places in the result.)
7. 200 parts were selected from a batch of parts for testing, of which 188 were qualified
requirements: (1) calculate the average sampling error of the qualified rate of this batch of parts
(2) interval estimation of the qualified rate of this batch of parts is made according to 95.45% reliability (t = 2)<
final examination paper of statistics course of Beijing University of information technology (volume a)
Beijing University of information technology
the first semester of 2007-2008 academic year
School of economics and management applicable professional class: Zhuhui 0501 0502
examination form: (closed volume)
I. multiple choice questions (15 sub questions in total, 1 point for each sub question), 15 points in total)
only one of the four options listed in each sub question meets the requirements of the question, please fill in the code in the brackets after the question. There was no score for wrong choice, multiple choice or no choice
1. Which of the following does not belong to the basic hypothesis (d) in univariate regression
A. for all x, the variance of the error terms is the same
B. the error terms follow the normal distribution
C. the error terms are independent of each other
D.
2. When the skewness coefficient of a group of data distribution is negative, the relationship among the mode, median and mean of the data is (a)
A. mode & gt; Median & gt; Mean
B. mean & gt; Median & gt; Mode
C. median & gt; Mode & gt; Mean
D. median & gt; Mean & gt; Mode
3. If the univariate regression equation is y = 11.64-0.25x, then the correct one in the following statement is (c)< There is a positive correlation between the independent variable and the dependent variable
C.
D.
4. If there are two groups of Series A and B, the average of (a) is highly representative< If a.1 ＜ 21 ＞ 2, the representativeness of the mean of sequence B is higher than B.1 ＜ 21 ＞ 2, the representativeness of the mean of sequence B is lower than C.1 = 21 ＞ 2, the representativeness of the mean of sequence a is higher than D.1 = 21 ＜ 2, the representativeness of the mean of sequence a is lower than B.1 ＜ 21 ＞ 2, The median value of the end group was (a)
a.520 b.510 c.500 d.540
6< The number of machines under the supervision of 20 workers is as follows: 2, 5, 4, 4, 3, 4, 4, 2, 2, 4, 3, 4, 4, 4, 4, 4, 2, 4, 4, 4, 4, 4, 6, 3, 4, 6, 3, 4, 5, 2, 4, 2, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 3, 4, 4, 4, 3, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 6, 3, 4
A. monomial grouping B. equidistant grouping C. unequal grouping D. all the above groups can be
8. If there is no seasonal change, the seasonal ratio should be (b)
a.0 B.1 C. greater than 1 D. less than 1
9. If a qualitative variable has m classes, then (c) mmy variables should be introced
a.m B.M + 1
c.m-1 D. unable to judge
10. The average length of service of the first group of workers is 5 years, the second group is 7 years, and the third group is 10 years. The number of workers in the first group accounts for 20% of the total number, and the second group accounts for 60%, The average length of service of the three groups of workers is (b)
A.8 years, b.7.2 years, C.5 years, d.7.8 years, Then the unit cost (d) of the plant in 2007 is
A. reced by 0.62%, B. increased by 0.62%
C. reced by 3.7%, D. increased by 3.7%
12. Sign (a) of correlation coefficient R and slope B2
A. same B. different
C. unable to judge
13. It is known that the composite price index of the two stocks bought by Xiaojiang has increased by 24 points. The average closing price of the stock today is 14 yuan, and the average closing price of the stock the day before yesterday is (c)
a.10.64 b.10.5
2. Any statistical distribution must satisfy___________ And_____________ There are two conditions
3. Sampling estimation is calculated by actual survey_____________ To estimate the corresponding______________ Numerical value
4_________ Variables, and independent variables are controllable___________ Variable
5_____________ And, uh, uh, uh, uh, uh, uh, uh, uh, uh< General survey is generally used to investigate the number of social and economic phenomena at a certain time point, and it does not exclude the investigation of items that belong to the period phenomenon
2. For the same population, the value of period index is directly proportional to the length of the period, and the value of time point index is inversely proportional to the interval of time points
3. In sampling inference, the total sum index value is definite and unique, while the sample index value is a random variable
4. The characteristics of sampling proportion are: the larger the sample proportion is, the larger the sampling average error is
5. In all kinds of dynamic series, the size of the index value is restricted by the length of the period reflected by the index< 3. Multiple choice questions (2 points for each sub question, (12 points in total)
1. The indivial things that constitute the statistical population are called ()
A. investigation unit B. mark value C. quality unit D. total unit
2. Compound grouping is ()
A. group two or more populations by using the same mark
B. group a complex mark for a population
C. group two or more populations for the same population Two or more markers should be selected for the same population and grouped in parallel
3. The total index should reflect the different time conditions, It is divided into ()
A. quantity index and quality index B. time index and time point index
C. total unit amount and total mark amount D. physical index and value index
4. The most common method and basic form of calculating average index is ()
A. median B. mode C. arithmetic mean D. harmonic mean
5, It can be divided into ()
A. total index and indivial index B. quantitative index and quality index
C. average index and average index D. comprehensive index and average index
6, ”The first and last half method is applicable to ()
A. calculate the sequence time average for time series; B. calculate the sequence time average for time series with equal interval; C. calculate the sequence time average for time series with unequal interval; D. calculate the sequence time average for dynamic series composed of two time series, (8 points in total)
1. Number of times distribution sequence ()
A. It is composed of two factors: the group divided by a certain mark and the number of units in each group Group limit and group median constitute
C. It includes quality distribution series and variable series
D. It can be expressed in the form of chart
e. it can prove the overall structure and distribution characteristics
2. The investigation unit is ()
a. the population to be investigated
B. the person in charge of the overall unit to be investigated
C. the undertaker of the investigation project
D. responsible for the report Unit of survey results
E. specific unit of survey objects
3. Sampling error in sampling estimation ()
A. is inevitable,
B. can be eliminated by improving survey methods,
C. can be calculated in advance,
D. can only be calculated after the end of the survey,
E. its size can be controlled />4. Suppose that the linear regression equation of unit cost (yuan) to output (100 pieces) is YC = 76-1.85x, which means ()
A. for every 100 pieces of output increased, the unit cost decreased by 1.85 yuan on average
B. for every 100 pieces of output decreased, The average unit cost decreased by 1.85 yuan
C. the output and unit cost changed in the opposite direction
D. the output and unit cost changed in the same direction
E. when the output was 200 pieces, the unit cost was 72.3 yuan
v. questions and answers (5 points for each sub question, 10 points in total)
1. Briefly describe the concept and function of variation index
2. What is the basic meaning and computer form of average index< The results of 40 students in a class are as follows:
57 89 49 84 86 87 75 72 68 75 82 97 81
67 81 54 79 87 95 76 71 60 90 65 76 72 70
86 85 89 89 64 57 83 81 78 87 72 61
school regulations: below 60 points is failure, 60-70 points is pass, 70-80 points is medium, 80-90 was good, 90-100
was excellent. Requirements:
(1) divide the class into five groups: fail, pass, medium, good and excellent, and work out a frequency distribution table
(2) indicate the grouping mark and type; Analyze the examination situation of the class
2. The proction situation of three workshops in a factory in the first quarter is as follows:
planned completion percentage of workshop, actual output (unit) and unit proct cost (RMB ＆ 92; RMB ×; According to the above data, we calculated: (1) the average planned completion percentage of the output of the three workshops in the first quarter.
(2) the average unit proct cost of the three workshops in the first quarter.
3, The unit is "Dan" 92; The linear regression equation between irrigation amount (expressed by X, unit is "inch") and irrigation amount (expressed by x) is YC = 2.82 + 1.56x. It is also known that the variance of variable x is 99.75 and that of variable y is 312.82
(2) calculate the average yield per mu when the irrigation amount increases by one inch
(3) calculate the correlation coefficient between irrigation amount and yield per mu, and analyze the degree and direction of correlation< 4. The unit cost of an enterprise's procts in 1988 is 2% lower than that in 1987, 5% lower than that in 1988, 3% lower than that in 1990, and 1.5% lower than that in 1990. Taking 1987 as the base period, this paper calculates the total and average rection rate of the unit cost of the enterprise from 1988 to 1991 It is required to write out the formula and calculation process, and keep four decimal places in the result.)
5 200 pieces were selected from a batch of parts for testing, of which 188 pieces were qualified
requirements: (1) calculate the average sampling error of the qualified rate of this batch of parts
(2) interval estimation of the qualified rate of this batch of parts is made according to 95.45% reliability (t = 2)< The unit cost of an enterprise's procts decreased by 2% in 1988 compared with 1987, 5% in 1989 compared with 1988, 3% in 1990 compared with 1989, and 1.5% in 1991 compared with 1990. Taking 1987 as the base period, this paper calculates the total and average decreasing speed of the unit cost of the enterprise from 1988 to 1991 It is required to write out the formula and calculation process, and keep four decimal places in the result.)
7. 200 parts were selected from a batch of parts for testing, of which 188 were qualified
requirements: (1) calculate the average sampling error of the qualified rate of this batch of parts
(2) interval estimation of the qualified rate of this batch of parts is made according to 95.45% reliability (t = 2)<
final examination paper of statistics course of Beijing University of information technology (volume a)
Beijing University of information technology
the first semester of 2007-2008 academic year
School of economics and management applicable professional class: Zhuhui 0501 0502
examination form: (closed volume)
I. multiple choice questions (15 sub questions in total, 1 point for each sub question), 15 points in total)
only one of the four options listed in each sub question meets the requirements of the question, please fill in the code in the brackets after the question. There was no score for wrong choice, multiple choice or no choice
1. Which of the following does not belong to the basic hypothesis (d) in univariate regression
A. for all x, the variance of the error terms is the same
B. the error terms follow the normal distribution
C. the error terms are independent of each other
D.
2. When the skewness coefficient of a group of data distribution is negative, the relationship among the mode, median and mean of the data is (a)
A. mode & gt; Median & gt; Mean
B. mean & gt; Median & gt; Mode
C. median & gt; Mode & gt; Mean
D. median & gt; Mean & gt; Mode
3. If the univariate regression equation is y = 11.64-0.25x, then the correct one in the following statement is (c)< There is a positive correlation between the independent variable and the dependent variable
C.
D.
4. If there are two groups of Series A and B, the average of (a) is highly representative< If a.1 ＜ 21 ＞ 2, the representativeness of the mean of sequence B is higher than B.1 ＜ 21 ＞ 2, the representativeness of the mean of sequence B is lower than C.1 = 21 ＞ 2, the representativeness of the mean of sequence a is higher than D.1 = 21 ＜ 2, the representativeness of the mean of sequence a is lower than B.1 ＜ 21 ＞ 2, The median value of the end group was (a)
a.520 b.510 c.500 d.540
6< The number of machines under the supervision of 20 workers is as follows: 2, 5, 4, 4, 3, 4, 4, 2, 2, 4, 3, 4, 4, 4, 4, 4, 2, 4, 4, 4, 4, 4, 6, 3, 4, 6, 3, 4, 5, 2, 4, 2, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 3, 4, 4, 4, 3, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 6, 3, 4
A. monomial grouping B. equidistant grouping C. unequal grouping D. all the above groups can be
8. If there is no seasonal change, the seasonal ratio should be (b)
a.0 B.1 C. greater than 1 D. less than 1
9. If a qualitative variable has m classes, then (c) mmy variables should be introced
a.m B.M + 1
c.m-1 D. unable to judge
10. The average length of service of the first group of workers is 5 years, the second group is 7 years, and the third group is 10 years. The number of workers in the first group accounts for 20% of the total number, and the second group accounts for 60%, The average length of service of the three groups of workers is (b)
A.8 years, b.7.2 years, C.5 years, d.7.8 years, Then the unit cost (d) of the plant in 2007 is
A. reced by 0.62%, B. increased by 0.62%
C. reced by 3.7%, D. increased by 3.7%
12. Sign (a) of correlation coefficient R and slope B2
A. same B. different
C. unable to judge
13. It is known that the composite price index of the two stocks bought by Xiaojiang has increased by 24 points. The average closing price of the stock today is 14 yuan, and the average closing price of the stock the day before yesterday is (c)
a.10.64 b.10.5
4. Basic ecation research methods are mainly as follows:
observation. Observation: in order to understand the truth, so as to find the essence and law of a phenomenon< br /> 2 Observation: the implementation of observation law is divided into the following three steps. The first step is the design of observational research, which can be roughly divided into the following aspects:
(1) investigation and preliminary observation
the purpose of this step is to collect the materials, but to master the basic information to correctly plan the whole observation process. For example: To observe the teaching work of teachers, they should inform the teachers, students, general understanding, working environment and conditions in advance. Through the conversation with teachers and school leaders, we can get some materials, such as teaching plan, teaching diary, students' works, and lectures,
(2) to determine the purpose observation center
according to the research task, the characteristics of the research object, what kind of materials and conditions to consider, what is wrong, then the specific requirements. If this requirement is not clear, you can't focus on observation and the results can't go deep. Observe several centers that cannot be observed around a wide range of centers. If you need to observe the center, it will take the group to observe a department< (3) to determine the whole range of the observed objects
confirm the target observation
identification follows three specific projects. For example, research newly assigned to a normal school, primary school or university graate in their spare time, business, cultural research, then, its purpose is to observe the life of teachers, new teachers for a year or two. Within this scope, then set a specific observation, several primary schools, some teachers, teaching and research. The specific observation list is determined, and then the time, occasion and specific observation items are determined<
(4) development observation plan for designated use
the center and scope of the observation plan, as well as the understanding of these problems, in addition to observation and collection of materials, the observation process can also be arranged as the observation, density and ration of each view, and how to adjust to ensure the observed phenomenon
(5) planning and preparation generally include two kinds:
a means of observation data, observation
observation means to save observation data
observation data are the main sensory organs, but sometimes some special tools are needed to help observation, such as being able to watch the screen, computer terminals, and more advanced, such as motor response. These tools are mainly from two aspects: to ensure the objectivity of observation, and improve the accuracy of observation
to save data, human brain is a natural organ. However, this observation method lacks accuracy and persistence, and can not achieve the goal of information. Therefore, it is the first to use words, graphics and symbols, which refers to the use of technical means, such as photography, audio, video and instantaneous observation, materials, persistent state data, accurate and comprehensive records, repeated observation and analysis of data
What does this mean, and before you are ready to start using various functions of the instrument, you should also observe and check to ensure that this process is not impaired, and you should pay attention to observation. As observers, we must master the basic methods, the instruments used, and observe what should be done. A lesson, a camera, a detailed and comprehensive shot is not enough. Observers should prepare several cameras and divide the work in advance. Even for observation and recording, a good design. You must record the format of writing arrangements, may agree with some record companies to sign a contract to minimize on-site records, record paper to print text
the classroom behavior records of our high school students, for example, are shown in Table 5-1. In the table below, according to the needs of the research, he believes that students' behavior in the classroom may occur. It is estimated that it is not fully listed, so observers need to reserve some space. If you want to help with other details of each project, it must be clear to researchers that they are familiar with the location of each project in unforeseen circumstances, in the sense of observation and observer. For the sake of safety, it can be observed that before the first practice, the observers are familiar with the contents of the table, the form adjustment, and the defects have been found
(6)
unified standards, in order to increase the objectivity of observation, measurement and evaluation, convenient for various phenomena, you can check and easily express, compare observed phenomena, observed results, statistical data, comprehensive, must consider their views may be the influence of many factors, these factors provide a unified standard. Different observers observe the same phenomenon for each observation, we must adhere to a unified standard to measure. This is mainly because different research projects often involve different standards. Some units, such as the quality of knowledge, how to measure the performance of students, such as the definition of disciplinary behavior, are problems in these calculations, such as how to register and the frequency of contradictory expression between students. Similar problems should be stipulated in advance
(7), the outline of partial display
based on the observation of the plan, the specific outline observed each time or each piece (some processing of the same nature, the observed combination) makes the audience's purpose, task and material of each observation very clear. The observed contour can include observation, in order to solve a specific problem, such as the previous observation based on careful consideration. Another way to make statistical information table
analysis of the observed actual process, and draw some conclusions. May be able to form a research topic
results:
the same order, to understand the facts, analyze the facts, draw conclusions, to a certain extent, to identify problems, improve the work (including improving research methods) or form new research topics
it includes questionnaire, interview and survey. In fact, in this case, a serious study and analysis, the conclusion is to find a solution or further research plan
the main steps of sampling survey are as follows:
actual sampling operation, the whole process can be roughly divided into br / & gt
to determine the purpose of the investigation (to determine the problem, to form a hypothesis; The investigation has verified this hypothesis and made a clear conclusion on this issue< br /> 2 Determine the population of the sample. Total information from the total sample (target population). The conclusion drawn from the sample is applied to the sample population, and the conclusion is applicable to the excessive range, depending on the difference degree of the target population in the overall sampling< br />
3 The determined data are collected. Generally speaking, there are only long questionnaires to collect relevant data. The purpose of the survey is to rece the number of answers to quality questions< br />
4 Select the sampling method. The whole device, fundamentally eliminate the indivial< br />
5 Draw up sampling frame. In the school directory, the student roll< br />
6 Determine the required accuracy. Sampling survey infers the whole, with a certain degree of uncertainty. The probability level of relative error or absolute error is required< br />
7 Estimate the sample size, estimate the cost< br />
8 Sampling test, trying to fill a small-scale questionnaire survey, and make necessary improvements< br />
9 On site investigation organization. A sampling survey plan was carried out. Return the questionnaire and check the quality in time. The table did not answer the treatment plan< br />
10 The data were analyzed according to the sampling method< br />
11 The same data were analyzed
12. Retain general information that they may play a role in guiding future sampling
for ecational phenomenon, it is sometimes difficult to carry out probability sampling in a strict sense. You can consider using the following method to sample probability sampling units (groups). For a sample of a small population group, select the impression of a representative population. The overall average of the researchers is very easy to take a limited population sample, and the sample is randomly selected, Staff of the voluntary survey. To choose an appropriate data analysis method, the sample should be carefully summarized. What should it be? Make full use of additional information to verify validation. Focus on the combination of wisdom, experience and sampling technology ecation phenomenon, and achieved a good example<
Test Method:
to describe some behaviors of a country, some behaviors (including: ability and achievement, personality, interest, or reasoning state, motivation, attitude and value, and psychological needs, etc.), policies or plans that can be considered, or converted to further form a new research topic
in ecation and psychology, measurement is used as an important method of quantitative research. Its main functions are assessment, diagnosis and prediction. Numbers or symbols (for example, XXX teacher, students' self-learning ability test (test), primary school, high school students' self-learning ability, if they can reach what extent)
according to the rules, there are some so-called attributes or characteristics of things or phenomena in the measurement process, An important content and form of ecation is represented by psychological measurement. Good or bad
/ in the process of testing, the meaning of testing system, the same test at different times, or different topics at the same time, should be the objective index of the same test control. In order to remain objective, stimulation will follow certain proceres (such as a warm week piano teacher invited me to give their parents a speech, before which, test, control, the purpose is to eliminate and avoid human factors, exclude any authenticity test, evaluate the identity of the standard)
objective inference, different people do the same reason should be consistent, the same person at different times, the same interpretation of the results should be the same
experience:
A & gt< br /> The fact of ecation, which is a commonly used method, is based on a wide range of ecational phenomena and experiences in Teachers' ecational practice, mining and analyzing experience materials, rising to the top of the height of ecational theory, new ecational guidelines, better scientific research methods of ecational practice. The key is to find out the practical and reasonable legal experience through the phenomenon, so as to better improve their teaching and ecation experience, and follow the following basic requirements:
1. Pay attention to advanced experience (the concept must be updated) in fact
comprehensively check and summarize the wholly-owned raw materials, "point" and "face-to-face", "point" and "face-to-face", so as to prevent one-sided sweeping objects / & gt
based ecational practice, rather than supposing it? Of course, this is not enough< br />
4 A good way to analyze literary theory
/ A & gt
reading literary works (including text, graphics, symbols, audio, video and other theoretical value and material procts of specific historical value)
observation. Observation: in order to understand the truth, so as to find the essence and law of a phenomenon< br /> 2 Observation: the implementation of observation law is divided into the following three steps. The first step is the design of observational research, which can be roughly divided into the following aspects:
(1) investigation and preliminary observation
the purpose of this step is to collect the materials, but to master the basic information to correctly plan the whole observation process. For example: To observe the teaching work of teachers, they should inform the teachers, students, general understanding, working environment and conditions in advance. Through the conversation with teachers and school leaders, we can get some materials, such as teaching plan, teaching diary, students' works, and lectures,
(2) to determine the purpose observation center
according to the research task, the characteristics of the research object, what kind of materials and conditions to consider, what is wrong, then the specific requirements. If this requirement is not clear, you can't focus on observation and the results can't go deep. Observe several centers that cannot be observed around a wide range of centers. If you need to observe the center, it will take the group to observe a department< (3) to determine the whole range of the observed objects
confirm the target observation
identification follows three specific projects. For example, research newly assigned to a normal school, primary school or university graate in their spare time, business, cultural research, then, its purpose is to observe the life of teachers, new teachers for a year or two. Within this scope, then set a specific observation, several primary schools, some teachers, teaching and research. The specific observation list is determined, and then the time, occasion and specific observation items are determined<
(4) development observation plan for designated use
the center and scope of the observation plan, as well as the understanding of these problems, in addition to observation and collection of materials, the observation process can also be arranged as the observation, density and ration of each view, and how to adjust to ensure the observed phenomenon
(5) planning and preparation generally include two kinds:
a means of observation data, observation
observation means to save observation data
observation data are the main sensory organs, but sometimes some special tools are needed to help observation, such as being able to watch the screen, computer terminals, and more advanced, such as motor response. These tools are mainly from two aspects: to ensure the objectivity of observation, and improve the accuracy of observation
to save data, human brain is a natural organ. However, this observation method lacks accuracy and persistence, and can not achieve the goal of information. Therefore, it is the first to use words, graphics and symbols, which refers to the use of technical means, such as photography, audio, video and instantaneous observation, materials, persistent state data, accurate and comprehensive records, repeated observation and analysis of data
What does this mean, and before you are ready to start using various functions of the instrument, you should also observe and check to ensure that this process is not impaired, and you should pay attention to observation. As observers, we must master the basic methods, the instruments used, and observe what should be done. A lesson, a camera, a detailed and comprehensive shot is not enough. Observers should prepare several cameras and divide the work in advance. Even for observation and recording, a good design. You must record the format of writing arrangements, may agree with some record companies to sign a contract to minimize on-site records, record paper to print text
the classroom behavior records of our high school students, for example, are shown in Table 5-1. In the table below, according to the needs of the research, he believes that students' behavior in the classroom may occur. It is estimated that it is not fully listed, so observers need to reserve some space. If you want to help with other details of each project, it must be clear to researchers that they are familiar with the location of each project in unforeseen circumstances, in the sense of observation and observer. For the sake of safety, it can be observed that before the first practice, the observers are familiar with the contents of the table, the form adjustment, and the defects have been found
(6)
unified standards, in order to increase the objectivity of observation, measurement and evaluation, convenient for various phenomena, you can check and easily express, compare observed phenomena, observed results, statistical data, comprehensive, must consider their views may be the influence of many factors, these factors provide a unified standard. Different observers observe the same phenomenon for each observation, we must adhere to a unified standard to measure. This is mainly because different research projects often involve different standards. Some units, such as the quality of knowledge, how to measure the performance of students, such as the definition of disciplinary behavior, are problems in these calculations, such as how to register and the frequency of contradictory expression between students. Similar problems should be stipulated in advance
(7), the outline of partial display
based on the observation of the plan, the specific outline observed each time or each piece (some processing of the same nature, the observed combination) makes the audience's purpose, task and material of each observation very clear. The observed contour can include observation, in order to solve a specific problem, such as the previous observation based on careful consideration. Another way to make statistical information table
analysis of the observed actual process, and draw some conclusions. May be able to form a research topic
results:
the same order, to understand the facts, analyze the facts, draw conclusions, to a certain extent, to identify problems, improve the work (including improving research methods) or form new research topics
it includes questionnaire, interview and survey. In fact, in this case, a serious study and analysis, the conclusion is to find a solution or further research plan
the main steps of sampling survey are as follows:
actual sampling operation, the whole process can be roughly divided into br / & gt
to determine the purpose of the investigation (to determine the problem, to form a hypothesis; The investigation has verified this hypothesis and made a clear conclusion on this issue< br /> 2 Determine the population of the sample. Total information from the total sample (target population). The conclusion drawn from the sample is applied to the sample population, and the conclusion is applicable to the excessive range, depending on the difference degree of the target population in the overall sampling< br />
3 The determined data are collected. Generally speaking, there are only long questionnaires to collect relevant data. The purpose of the survey is to rece the number of answers to quality questions< br />
4 Select the sampling method. The whole device, fundamentally eliminate the indivial< br />
5 Draw up sampling frame. In the school directory, the student roll< br />
6 Determine the required accuracy. Sampling survey infers the whole, with a certain degree of uncertainty. The probability level of relative error or absolute error is required< br />
7 Estimate the sample size, estimate the cost< br />
8 Sampling test, trying to fill a small-scale questionnaire survey, and make necessary improvements< br />
9 On site investigation organization. A sampling survey plan was carried out. Return the questionnaire and check the quality in time. The table did not answer the treatment plan< br />
10 The data were analyzed according to the sampling method< br />
11 The same data were analyzed
12. Retain general information that they may play a role in guiding future sampling
for ecational phenomenon, it is sometimes difficult to carry out probability sampling in a strict sense. You can consider using the following method to sample probability sampling units (groups). For a sample of a small population group, select the impression of a representative population. The overall average of the researchers is very easy to take a limited population sample, and the sample is randomly selected, Staff of the voluntary survey. To choose an appropriate data analysis method, the sample should be carefully summarized. What should it be? Make full use of additional information to verify validation. Focus on the combination of wisdom, experience and sampling technology ecation phenomenon, and achieved a good example<
Test Method:
to describe some behaviors of a country, some behaviors (including: ability and achievement, personality, interest, or reasoning state, motivation, attitude and value, and psychological needs, etc.), policies or plans that can be considered, or converted to further form a new research topic
in ecation and psychology, measurement is used as an important method of quantitative research. Its main functions are assessment, diagnosis and prediction. Numbers or symbols (for example, XXX teacher, students' self-learning ability test (test), primary school, high school students' self-learning ability, if they can reach what extent)
according to the rules, there are some so-called attributes or characteristics of things or phenomena in the measurement process, An important content and form of ecation is represented by psychological measurement. Good or bad
/ in the process of testing, the meaning of testing system, the same test at different times, or different topics at the same time, should be the objective index of the same test control. In order to remain objective, stimulation will follow certain proceres (such as a warm week piano teacher invited me to give their parents a speech, before which, test, control, the purpose is to eliminate and avoid human factors, exclude any authenticity test, evaluate the identity of the standard)
objective inference, different people do the same reason should be consistent, the same person at different times, the same interpretation of the results should be the same
experience:
A & gt< br /> The fact of ecation, which is a commonly used method, is based on a wide range of ecational phenomena and experiences in Teachers' ecational practice, mining and analyzing experience materials, rising to the top of the height of ecational theory, new ecational guidelines, better scientific research methods of ecational practice. The key is to find out the practical and reasonable legal experience through the phenomenon, so as to better improve their teaching and ecation experience, and follow the following basic requirements:
1. Pay attention to advanced experience (the concept must be updated) in fact
comprehensively check and summarize the wholly-owned raw materials, "point" and "face-to-face", "point" and "face-to-face", so as to prevent one-sided sweeping objects / & gt
based ecational practice, rather than supposing it? Of course, this is not enough< br />
4 A good way to analyze literary theory
/ A & gt
reading literary works (including text, graphics, symbols, audio, video and other theoretical value and material procts of specific historical value)
5. Very optimistic.........
6. Unknown_Error
7. 1. Log in Linux with root< br />2. vi /root/stu_ Name (write down the names of your classmates, one line for each, in pinyin or English)
3. For I in ` cat / root / stu_ name`; do useradd $i -p 111111; Done (add an account and set a password 111111 for each account)
done.
3. For I in ` cat / root / stu_ name`; do useradd $i -p 111111; Done (add an account and set a password 111111 for each account)
done.
8. After the conversion, you can take the mmy variable as a constant distance variable to do regression analysis
9. Under my computer management local users and groups, there are two items,
one is "user" and the other is "group"
one: user
name Description suggestion
administrator -- system administrator account -- cannot be deleted, It can't be stopped either
guest -- the account for guests to visit can be deleted
helpassistant --- provide remote assistance account --- keep, disable< br />SUPPORT_ 388945a0 - help and support service provider account - reserved, deactivated
prompt: if you have created other user accounts before, you can delete them now<
Two: Group
name Description suggestion
administrator -- administrator has unrestricted
full access to the computer -- reserved
backup operators -- backup operators can replace security restrictions for backup or restore
files -- keep and disable
guests -- have the same access rights as guests, but less restrictions than guests
network configuration operators - can configure some network functions of the management network - keep or stop
power users -- owns most of the management rights, but there are also
restrictions. They can run verified applications
programs, and they can also run old versions of applications -- keep them
remote desktop users - members of this group are granted
permissions for remote login
replicator -- supports file replication in the domain -- retains and deactivates
users -- users can't make intentional or unintentional
changes. Therefore, users can run the
certified files, But it can't run large
most of the old versions of applications -- keep, stop
helpservicesgroup -- help and support center group -- keep, stop;
one is "user" and the other is "group"
one: user
name Description suggestion
administrator -- system administrator account -- cannot be deleted, It can't be stopped either
guest -- the account for guests to visit can be deleted
helpassistant --- provide remote assistance account --- keep, disable< br />SUPPORT_ 388945a0 - help and support service provider account - reserved, deactivated
prompt: if you have created other user accounts before, you can delete them now<
Two: Group
name Description suggestion
administrator -- administrator has unrestricted
full access to the computer -- reserved
backup operators -- backup operators can replace security restrictions for backup or restore
files -- keep and disable
guests -- have the same access rights as guests, but less restrictions than guests
network configuration operators - can configure some network functions of the management network - keep or stop
power users -- owns most of the management rights, but there are also
restrictions. They can run verified applications
programs, and they can also run old versions of applications -- keep them
remote desktop users - members of this group are granted
permissions for remote login
replicator -- supports file replication in the domain -- retains and deactivates
users -- users can't make intentional or unintentional
changes. Therefore, users can run the
certified files, But it can't run large
most of the old versions of applications -- keep, stop
helpservicesgroup -- help and support center group -- keep, stop;
10. In Windows XP, you can select "settings → advanced → change" in "control panel → system → advanced → performance" to open the virtual memory setting window. In the drive [volume label], the default selection is the partition where the system is located. If you want to change to another partition, you should first set the original partition as a non paged file, and then select another partition
or WinXP generally requires more than 256M of physical memory. If you like to play large-scale 3D games, and the memory (including video memory) is not large enough, the system will often prompt that the virtual memory is not enough, and the system will automatically adjust (the virtual memory is set to system management)
if your hard disk space is large enough, you can also set the virtual memory by yourself. The specific steps are as follows: right click "my computer" → properties → advanced → performance settings → advanced → virtual memory change → select the partition where the virtual memory (page file) is stored → self define the size → determine the maximum and minimum values → set. Generally speaking, the virtual memory is 1.5 times of the physical memory. If you don't want the virtual memory to change frequently, you can set the maximum and minimum values to the same<
44 "how to use the virtual memory
Microsoft has provided us with an official solution to the problem of how to set the virtual memory. In general, we recommend the following setting methods:
(1) set the page file in the partition where the windows system is located. The size of the file is determined by your system setting. The specific setting method is as follows: Open & quot; My computer & quot; Of & quot; Attribute & quot; Set the window and switch to & quot; Advanced & quot; Tab, in & quot; Startup and fault recovery & quot; The & quot; Write debug information & quot; Column, if you use & quot; No & quot;, Then set the page file size to about 2MB. If & quot; Core memory storage & quot; And & quot; Full memory storage;, Then set the page file value to be larger, which is similar to the physical memory
tip: there is a contradiction about whether the system partition should set the page file: if it is set, the system may read this part of the page file frequently, thus increasing the load of the track where the system disk is located. However, if it is not set, when the system has a blue screen crash (especially stop error), the mp file (memory. DMP) cannot be created, So we can't debug the program and report the error. So the compromise is to set a smaller page file on the system disk, as long as it is enough
(2) create a separate blank partition, and set the virtual memory in the partition. The minimum value is set to 1.5 times of the physical memory, and the maximum value is set to 3 times of the physical memory. The partition is specially used to store page files, and do not store any other files. The reason why a partition is divided separately to set up virtual memory is mainly based on two considerations: first, because there are no other files on the partition, the partition will not proce disk fragments, which can ensure that the data reading and writing of page files will not be interfered by disk fragments; Second, according to the memory management technology of windows, windows will give priority to the use of
page files on infrequently accessed partitions, which also reces the chance of reading the page files in the system disk and reces the pressure on the system disk
(3) other hard disk partitions do not set any page files. Of course, if you have more than one hard disk, you can create a page file for each hard disk. When the information is distributed on multiple page files, the hard disk controller can perform read and write operations on multiple hard disks at the same time. In this way, the system performance will be improved
tip:
the minimum value of virtual memory allowed to be set is 2MB, and the maximum value cannot exceed the remaining space value of the current hard disk, and also cannot exceed the memory addressing range of 32-bit operating system - 4GB.
or WinXP generally requires more than 256M of physical memory. If you like to play large-scale 3D games, and the memory (including video memory) is not large enough, the system will often prompt that the virtual memory is not enough, and the system will automatically adjust (the virtual memory is set to system management)
if your hard disk space is large enough, you can also set the virtual memory by yourself. The specific steps are as follows: right click "my computer" → properties → advanced → performance settings → advanced → virtual memory change → select the partition where the virtual memory (page file) is stored → self define the size → determine the maximum and minimum values → set. Generally speaking, the virtual memory is 1.5 times of the physical memory. If you don't want the virtual memory to change frequently, you can set the maximum and minimum values to the same<
44 "how to use the virtual memory
Microsoft has provided us with an official solution to the problem of how to set the virtual memory. In general, we recommend the following setting methods:
(1) set the page file in the partition where the windows system is located. The size of the file is determined by your system setting. The specific setting method is as follows: Open & quot; My computer & quot; Of & quot; Attribute & quot; Set the window and switch to & quot; Advanced & quot; Tab, in & quot; Startup and fault recovery & quot; The & quot; Write debug information & quot; Column, if you use & quot; No & quot;, Then set the page file size to about 2MB. If & quot; Core memory storage & quot; And & quot; Full memory storage;, Then set the page file value to be larger, which is similar to the physical memory
tip: there is a contradiction about whether the system partition should set the page file: if it is set, the system may read this part of the page file frequently, thus increasing the load of the track where the system disk is located. However, if it is not set, when the system has a blue screen crash (especially stop error), the mp file (memory. DMP) cannot be created, So we can't debug the program and report the error. So the compromise is to set a smaller page file on the system disk, as long as it is enough
(2) create a separate blank partition, and set the virtual memory in the partition. The minimum value is set to 1.5 times of the physical memory, and the maximum value is set to 3 times of the physical memory. The partition is specially used to store page files, and do not store any other files. The reason why a partition is divided separately to set up virtual memory is mainly based on two considerations: first, because there are no other files on the partition, the partition will not proce disk fragments, which can ensure that the data reading and writing of page files will not be interfered by disk fragments; Second, according to the memory management technology of windows, windows will give priority to the use of
page files on infrequently accessed partitions, which also reces the chance of reading the page files in the system disk and reces the pressure on the system disk
(3) other hard disk partitions do not set any page files. Of course, if you have more than one hard disk, you can create a page file for each hard disk. When the information is distributed on multiple page files, the hard disk controller can perform read and write operations on multiple hard disks at the same time. In this way, the system performance will be improved
tip:
the minimum value of virtual memory allowed to be set is 2MB, and the maximum value cannot exceed the remaining space value of the current hard disk, and also cannot exceed the memory addressing range of 32-bit operating system - 4GB.
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