BTC oxidation

1.

Mine disaster refers to the accident in the process of mining, which usually causes great risk of casualties. At least thousands of people die in mine disaster every year in the world. The common mine disasters include: gas explosion, coal st explosion, gas outburst, water leakage accident, mine fire, roof collapse, etc. In 2003, China proced about 35% of the world's coal, but accounted for about 80% of the deaths in coal mine accidents

China is a big coal procing country, a country heavily dependent on coal energy, and also a country with mining disasters. The main causes of the mine disaster are illegal mining, proction errors, equipment aging and faults. Each mine accident shows that solving these problems needs the unified coordination of all levels of departments. Only by constantly strengthening the management of mining, can the occurrence of mine accidents be effectively reced

It is a serious disaster in coal mine proction that gas is mixed with air, oxidizes rapidly at high temperature and proces shock wave. In 1675, a large-scale gas explosion occurred in Mostyn coal mine in England. Since then, major gas or gas and coal st explosion accidents have occurred many times in major coal mining countries. On April 26, 1942, a gas and coal st explosion occurred in Benxi Coal Mine, China, which was occupied by Japan. 1528 people died and 268 people were injured on the spot. It was the largest coal mine explosion in the world. With the development of coal mine proction technology and the improvement of gas control measures, such accidents have been graally reced

the main fire sources of gas explosion in China's coal mines are electric spark and blasting, and the main place of occurrence is mining face. The instantaneous temperature of coal mine gas explosion can reach 1850 ~ 2650 ℃, and the pressure can reach 9 times of the initial pressure. The gas near the explosion source impacts outward at a speed of several hundred meters per second, causing casualties and damage to the roadway and equipment. After the explosion, the oxygen concentration decreases and a large amount of CO2 and Co are generated, which may cause asphyxiation and poisoning

2. What is bitcoin to eat?

3. Nut cloud storage software supports windows, MAC, Linux, IOS (iPad and iPhone), Android, Windows Phone, web and other platforms.

4. I've played too. Don't play any more. It's just deceiving. When you asked for five yuan, he said that you didn't ask until level 40. When you get to level 40, it's a lie to say how many videos you need to watch.

5. The strongest Daren this game you have to play the level enough, 20 yuan words can be withdrawn once a day.

6. Because bitcoin is too risky

7. Carbonaceous compounds are not necessarily organic compounds, but organic compounds must contain carbon elements. Organic compounds can be burned, so salts are not organic compounds, organic compounds are flammable and insoluble in water, and combustion procts contain carbon dioxide (Note: carbon monoxide is not an organic compound)

8. C:\ Documents and Settings\ Administrator\ My Documents\ LOLReplay\ Replays
generally, the system is installed on disk C
lolreplay is a completely free lol video tool developed by the Chinese official website of lolreplay. It is perfectly compatible with national service and easy to operate. First, open the lolreplay video tool and enter the readout section. The software will automatically record the video After May 22, 2013, the Chinese version of lolreplay is no longer updated, that is, it cannot be used in the current version)
Development:
lol does not have its own video recording function, so if you do not have a special video recording software, you will not save any videos. It's impossible to find out where the video is kept.

9.

MD5 output 128 bits, SHA1 output 160 bits, sha256 output 256 bits

MD5 message digest algorithm, a widely used cryptographic hash function, can proce a hash value of 128 bits (16 bytes) to ensure the integrity and consistency of information transmission

2. SHA1 secure hash algorithm is mainly suitable for the digital signature algorithm defined in the digital signature standard. SHA1 generates a 160 bit message digest for messages less than 2 ^ 64 bits in length

3, the sha256 hash value is used as a unique value to represent the fixed size of a large amount of data. A small change in the data can result in an unpredictable large number of changes in the hash value. The hash size of sha256 algorithm is 256 bits

extended data:

MD5 application:

1, consistency verification

the typical application of MD5 is to generate information summary for a piece of information to prevent tampering. Specifically, the MD5 value of the file is like the "digital fingerprint" of the file. The MD5 value of each file is different. If anyone makes any changes to the file, the MD5 value, that is, the corresponding "digital fingerprint", will change

for example, the download server provides a MD5 value for a file in advance. After downloading the file, the user uses my algorithm to recalculate the MD5 value of the downloaded file. By comparing the two values, we can determine whether the downloaded file is wrong or tampered with

2. The typical application of digital signature

MD5 is to generate fingerprint on a message (byte string) to prevent it from being "tampered"

example: write a paragraph in a file called readme.txt, generate a MD5 value for the readme.txt and record it, and then propagate the file to. If you modify any content in the file, you will find that (the two MD5 values are not the same) when you recalculate MD5 for the file

if there is a third-party certification authority, MD5 can also prevent the "repudiation" of the file author, which is the so-called digital signature application

MD5 is also widely used in the login authentication of operating system, such as UNIX, login password of various BSD systems, digital signature and so on. For example, in UNIX system, the user's password is stored in the file system after hash operation with MD5 (or other similar algorithm)

when the user logs in, the system performs MD5 hash operation on the password entered by the user, and then compares it with the MD5 value saved in the file system to determine whether the password is correct

even if the source program and algorithm description are exposed, it is impossible to transform an MD5 value back to the original string. Mathematically speaking, there are infinitely many original strings, which is a bit like a mathematical function without inverse function