Vientiane story: how to mine

1. Very good. Public hospital, Grade 3A, with its own health management center, is the best physical examination center in Zhuzhou.

2. Regular physical examination is about a hundred yuan. You can consult their physical examination center for specific expenses.

3. First of all, it is clear that the main difference between conservative force and non conservative force is that the work of conservative force has nothing to do with the path that the object moves through, but only with the position of the starting point and the ending point of the moving object, and of course also with the nature of the conservative force field; The work of non conservative force is not only related to the position of the starting point and the ending point of the moving object and the nature of the force field, but also related to the path of the moving object
for example, since the work done by the non conservative force is related to the path of the moving object, if the object goes around a closed path, the non conservative force does work on the object, and the work done by the conservative force is always zero. Non conservative force is also known as "dissipative force". For example, human cart works by overcoming friction, and friction is non conservative force.
forces that work on paths are called non conservative forces. The common friction force and the impact force of inelastic collision between objects are all non conservative forces. The non conservative force has the characteristic that the work along any closed path is not equal to zero

Add: because the work done by friction is related to the path of the moving object [that is, the distance of moving in the direction of the force]

respondent: Fengli University - grade 12 2010-4-2 09:2

the above answer is correct

supplementary question: non conservative force is the effect of force, which is not only related to the head end position, but also related to the path. So, the effect of friction is related to the head end position and path? Why

questioner: mrkpur

let me say a few more words, because the direction of friction is always in a straight line with the direction of relative motion or relative motion trend of the object, so as long as the object has relative motion or relative motion trend and the contact surface is not absolutely smooth, the friction will continue to do work, With the accumulation of relative motion or relative motion trend, the work done by friction is also accumulated, which means that each very short (differential) time period corresponding to friction has its "independent" work "displacement
if the relative motion or relative motion trend always occurs in a straight line, and the friction force (size and direction) is constant, then the work done by the friction force can be calculated according to the displacement of its initial and final position
on the contrary, it can't, just because of the problem of "independent" displacement, the combined displacement can't be used to replace the accumulated displacement of friction when doing work in the path.

4.

Each person's physical condition is different, and the project is also different. I'll show you the network map and ask you some questions carefully

5. It must not be an elastic collision. For example, in the process of a bullet passing through a block of wood, there is relative motion between the bullet and the block of wood. Friction must do work to convert part of the mechanical energy of the system into internal energy. So it must not be an elastic collision.

6. Unknown_Error

8. Microsoft (NASDAQ: MSFT, HKEx: 4338) is the leader of PC software development in the world, and Bill Gates is its founder. MS-DOS, the operating system software developed by Microsoft for IBM-PC in 1981, has been used in hundreds of millions of IBM-PC and its compatible computers. But with the growing of Microsoft, Microsoft and IBM have become competitors in many aspects. In 1991, IBM and apple computer, Inc. terminated their cooperative relationship with Microsoft. However, the cooperative relationship between IBM and Microsoft has never stopped. The two companies maintain a complex relationship of competition and cooperation. Microsoft's procts include file system software [MS-DOS and XENIX: XENIX is a personal computer version of UNIX operating system, which was developed by Microsoft in 1979 for Intel processor. It can also be executed on Dec PDP-11 or apple Lisa computer. Inheriting the characteristics of UNIX, XENIX has a multi person and multi work working environment, which conforms to the UNIX System V interface specification (SVID), operating environment software (windows series), application software MS office, multimedia and computer games, computer related books and CDROM procts. In 1992, the company bought Fox company and stepped into the database software market< In 1975, 19-year-old Bill Gates dropped out of Harvard University and sold basic with his high school alumni Paul Allen; All purpose symbolic instruction code. It is a programming language designed for beginners. When Gates was still at Harvard, they worked on languages for Altair at MITs. Later, gates and Allen moved to Albuquerque and founded Microsoft in a local hotel room. In 1979, MITs closed down, and Microsoft continued to develop its main business by modifying basic programs< In 1977, Microsoft moved to Bellevue (Redmond) in Seattle to develop PC programming software. In 1980, IBM selected Microsoft to write the key operating system software for its new PC, which was a significant turning point in the development of the company. Due to time constraints and complicated programs, Microsoft bought the right to use an operating system from Patterson, a programmer in Seattle, for $50000, and then rewritten it into MS-DOS. At present, the company has branch offices in more than 60 countries and employs nearly 44000 people worldwide

the popularity of IBM-PC makes MS-DOS a great success, because other PC manufacturers want to be compatible with IBM. MS-DOS is licensed by many companies, so it became the standard operating system of PC in 1980s. By 1984, Microsoft had more than $100 million in sales. Later, Microsoft continued to develop software for computers of IBM, apple and radio equipment company. But after 1991, because of the conflict of interest, IBM and Apple had turned against Microsoft. In 1983, Paul Allen left Microsoft with Hodgkin's disease and later set up his own company. Allen owns 15% of Microsoft and is still on the board. In 1986, the company became public. Gates retained a 45% stake in the company, making it the first billionaire in the PC instry in 1987. In 1996, his total personal assets exceeded 18 billion US dollars. In 1997, it reached US $34 billion, and in 1998, it exceeded the 50 billion mark, becoming the world's richest man<

Windows 95 / 98 / me / NT / 2000 / me / XP / Server2003 / Vista, Microsoft's flagship proct, has successfully occupied a wide market from PC to business workstation and even server, which has brought huge profits to Microsoft: the company has also come from behind in Internet software and seized a large market share. In the IT software instry, there is such a warning: "never do what Microsoft wants to do.". It can be seen that the huge potential of Microsoft has penetrated into all aspects of the software instry. It is almost omnipresent and invincible. Microsoft's great influence has already exerted great pressure on its software peers, and has also pushed itself into the position of defendant in the anti-monopoly law. Even Intel, which has been a reliable partner for many years, has turned against it. In September 2001, in view of the economic downturn, the US government intended to revive the US Information Instry and refused to split Microsoft. So far, the anti-monopoly law against Microsoft has come to an end<

the situation of Microsoft in China

since 1992, when Microsoft entered China to set up a representative office in Beijing, the total number of employees of Microsoft in China has increased to more than 900, forming a structure with Beijing as its headquarters and branches in Shanghai and Guangzhou. Microsoft has also gone through three stages of development in China

the first stage of Microsoft's development in China was from 1992 to 1995. At this stage, Microsoft mainly developed its own market and sales channels

from 1995 to 1999 is the second stage of Microsoft's development in China. At this stage, Microsoft has successively established three world-class scientific research, proct development and technical support service organizations in China: Microsoft China research and development center, Microsoft global technical support center and Microsoft Asia Research Institute. Microsoft China has become the most complete subsidiary of Microsoft in the United States

since 2000, Microsoft has entered the third stage of development in China. At this stage, Microsoft China will take common progress and development with China's software instry as its goal, increase investment and cooperation in China's software instry, and promote the development of China's IT instry with its own intellectual property rights. This not only confirms Microsoft's long-term development strategy in China, but also shows its solemn commitment to "bring the most advanced electronic information technology to China and make common progress with China's computer instry"

Microsoft China is well aware that its success is inseparable from the support of government departments, the trust of instry partners and the love of users. Looking forward to the future, Microsoft is willing to work hand in hand with China's information instry and continue to make efforts to march towards a more brilliant 21st century.

9. Two people upstairs, please don't make mistakes... Nonsense
MBR is called master boot record, which is the main boot record of hard disk
the master boot of the hard disk is recorded in the 0 head 0 cylinder 1 sector of the hard disk< The main boot record consists of three parts:
(1) main boot program
(2) four partition tables DPT, disk partition table)
(3) valid flag word of main boot record
the above is a broad sense, while the narrow sense of MBR only refers to the boot program
to view, download a WinHex, menu tools open disk (F9) - select the disk (physical) you want to view. The first 512 bytes is MBR. The partition table is 64 bytes, from 1beh to 1fdh (the following h indicates that the number is hexadecimal, don't be scared)
you can also use the partition magician to select the hard disk and right-click to view the sector (512 bytes at the beginning, with lines drawn). There is still a lot of knowledge about MBR. Here is just a beginning for you. You need to find more information