The earliest individual mining in China
You can't dig in a day. It takes 2000 years
the global unified computing difficulty of bitcoin is 2621404453 (expected to change in two days). It takes more than 2000 years for a 2.5GHz CPU to work out a bitcoin
in order to make the graphics card fully loaded for a long time, the power consumption will be quite high, and the electricity bill will be higher and higher. Many professional mines at home and abroad are operated in areas with extremely low electricity charges, such as hydropower stations, while more users can only mine at home or in ordinary mines, so the electricity charges are not cheap. Even in a certain residential area in Yunnan, there was a case of crazy mining, which led to a large area trip of the residential area, and the transformer was burned
extended data:
bitcoin network generates new bitcoin through "mining". In essence, the so-called "mining" is to use computers to solve a complex mathematical problem to ensure the consistency of bitcoin network distributed accounting system
bitcoin network will automatically adjust the difficulty of mathematical problems, so that the whole network can get a qualified answer about every 10 minutes. Then bitcoin network will generate a certain amount of bitcoin as block reward to reward the person who gets the answer
when bitcoin was born in 2009, block rewards were 50 bitcoins. Ten minutes after its birth, the first 50 bitcoins were generated, and the total amount of money at this time is 50. Then bitcoin grew at a rate of about 50 every 10 minutes. When the total amount reaches 10.5 million (50% of 21 million), the block reward will be halved to 25
when the total amount reaches 15.75 million (5.25 million new output, i.e. 50% of 1050), the block reward will be further halved to 12.5. The monetary system used to have no more than 10.5 million in four years, after which the total number will be permanently limited to about 21 million
Primitive human beings have been able to collect stones, grind them into proction tools, and collect clay for pottery making, which is the earliest germination of mining. Mining in ancient China has a long history. Unearthed from the ancient copper mine site in Tonglushan, Daye, Hubei Province, are various proction tools made of copper, iron, wood, bamboo, stone, pottery, copper ingot, copper weapons, etc., which are used for mining, loading, lifting, drainage, lighting, etc., and prove that the combined development of shaft, inclined shaft and drift has been used in the spring and Autumn period, and the underground mining system has initially formed. By the Western Han Dynasty, the mining system had been quite perfect. At this time in Hebei, Shandong, Hubei and other places of iron, copper, coal, placer gold and other mines have begun mining. At the end of the Warring States period, Li Bing, the governor of the state of Qin and Shu, g salt wells in Shuangliu County, Sichuan Province. Before Ming Dynasty, iron, copper, tin, lead, silver, gold, mercury and zinc were mainly proced. At the beginning of the 17th century, Europeans used the black powder imported from China for mining, and replaced manual mining with rock drilling and blasting, which was a milestone in the development of mining technology. At the end of the 19th century and the beginning of the 20th century, mining explosives, detonators, detonating cords and rock drilling equipment were successively invented, forming modern blasting technology; The use of electric mechanical shovel, electric locomotive and electric lifting, communication, drainage and other equipment has formed modern shipping technology. Since the first half of the 20th century, mining technology has developed rapidly, with the emergence of ammonium nitrate explosive, the use of underground deep hole blasting technology, the continuous improvement and large-scale of various mining equipment, and graally formed mechanized mining technology suitable for different deposit conditions. The scientific methods of mine design, deposit evaluation and mine plan management are put forward to make mining develop from technology to engineering science. After the 1950s, e to the use of down the hole drill, cone drill, self drilling jumbo and other new equipment, mining equipment to achieve large-scale, transportation and lifting equipment automation, the emergence of unmanned locomotives. Computer technology is used in mine proction management, planning and design and scientific calculation. System science is used to study mining problems, and system mining engineering is born. Mine proction began to establish automatic control system, using modern test equipment, testing technology and electronic computers to predict and solve some practical problems. Therefore, the subject of mining engineering has been formally proposed and recognized
Step 3: find the original installation file of cad2007 and find the simplified Chinese version of AutoCAD2007 in the directory; Bin\ acadFeui\ Program Files\ Root\ Support\ Dfst.dll is deleted manually
finally, restart the computer and re install cad2007. The installation process prompts you "error 1308. Source file not found:...
this method is very good, I hope it can help you!
the word "China" appeared very early and was widely used in Chinese classical literature. This term first appeared in the early Western Zhou Dynasty about 3000 years ago. On a cultural relic unearthed in 1963 from the period of King Wu of the Western Zhou Dynasty, there are some words such as "Yu Qi Zhai Zi Zhong or". According to archaeological and philological experts, "zhongor" is "China". In ancient China, the meaning of "Guo" was interpreted as "Yu" or "bang"“ "China" is "the territory of the central government" or "the help of the central government"
in ancient literature, the word "China" has five different meanings: first, it specifically refers to the capital of the country where the emperor is located, that is, the capital. For example, in the book of songs, Daya and minlao, "we should benefit China and slow down the four sides" (we should first love the people in Kyoto and then pacify the four sides) Mencius, Gongsun Chou: I want to teach Mencius room to China... (I want to build a house for Mencius in the capital of the country and let it ecate the disciples of the king and his officials); Second, it refers to the Kingdom directly ruled by the emperor; Third, it refers to the Central Plains; 4. The mainland of China; Five refers to the ancient Chinese nationality, Han nationality living area or the establishment of the country. Most of the Chinese and Han nationalities in China built their capitals in the north and south of the Yellow River, and constantly expanded their scope of activities. Therefore, the middle and lower reaches of the Yellow River are called "China", which has the same meaning as "China", "Zhonghua", "Zhongzhou" and "Zhongyuan"< After the Qin Dynasty, the meaning of "China" has changed. In the Han Dynasty, the Central Plains Dynasty established by the Han people is often called "China", and the Central Plains Dynasty established by the brothers is also called "China". During the southern and Northern Dynasties, the Southern Dynasty called itself "China", but called it "island barbarians". Liao Dynasty and Northern Song Dynasty, Jin Dynasty and Southern Song Dynasty call themselves "China" but do not recognize each other as "China"
strictly speaking, ancient "China" is an adjective, not a proper noun. That is to say, no Dynasty in ancient China took "China" as its official name. For example, the name of the Han Dynasty was Han, the name of the Tang Dynasty was Tang, and the names of the later dynasties were song, Liao, Jin, yuan, Ming, etc. the name of the country signed by the Qing government and foreign countries was "Great Qing". Therefore, the word "China" in historical records does not mean China as we say today< It was not until after the revolution of 1911 that "China" was taken as the abbreviation of "the Republic of China". After the liberation of the whole country, we also took "China" as the abbreviation of "people's Republic of China". Now there is only one China in the world, which is the people's Republic of China.