Examination questions of pre job training for mining machinery
Publish: 2021-05-05 13:18:53
1. You can find Blizzard mining machine, reasonable cost, high mining efficiency, high configuration, optional
2. Edison, the world-famous "king of invention", only went to primary school for three months in his life. His habit of asking questions shamelessly is regarded as an incompetent child, and his knowledge comes from his mother's teaching and self-study. Most of his success should be attributed to his mother's understanding and patience
Edison was curious about many things since he was a child, and he liked to experiment with them himself until he understood the truth. When he grew up, he devoted himself to research and invention according to his own interests. He set up a laboratory in New Jersey and invented more than 2000 kinds of things in his life, such as electric lamp, telegraph, phonograph, video camera, magnetic separator, crusher and so on. Edison's strong research spirit made him make great contribution to the improvement of human life style< Now let me tell you something interesting about Edison's invention of electric light< As early as 1821, British scientists David and Faraday invented an electric lamp called arc lamp. This kind of electric lamp uses carbon rod as filament. Although it can emit bright light, but the light is dazzling, power consumption is large, life is not long, it is not practical. Therefore, Edison secretly resolved: "arc lamp is not practical, I must invent a kind of electric lamp with soft light, so that every household can use it."
his experiment began with the material of filament: traditional carbon strips were used as filament, and the filament would break as soon as electricity was turned on. Ruthenium, chromium and other metals are used as the filament. After being electrified, it will burn out after a short time. The effect of using platinum filament as filament is not ideal. In this way, Edison tested more than 1600 materials. Many experts think that the future of electric light is bleak because of the tests and failures. Some famous British experts even ridiculed Edison's research as "meaningless". Some reporters also reported: "Edison's ideal has come to nothing." Edison faced failure, faced with all people's sarcasm, Edison did not retreat. He understood that failure is the mother of success, and every failure means a step closer to success.
Edison was curious about many things since he was a child, and he liked to experiment with them himself until he understood the truth. When he grew up, he devoted himself to research and invention according to his own interests. He set up a laboratory in New Jersey and invented more than 2000 kinds of things in his life, such as electric lamp, telegraph, phonograph, video camera, magnetic separator, crusher and so on. Edison's strong research spirit made him make great contribution to the improvement of human life style< Now let me tell you something interesting about Edison's invention of electric light< As early as 1821, British scientists David and Faraday invented an electric lamp called arc lamp. This kind of electric lamp uses carbon rod as filament. Although it can emit bright light, but the light is dazzling, power consumption is large, life is not long, it is not practical. Therefore, Edison secretly resolved: "arc lamp is not practical, I must invent a kind of electric lamp with soft light, so that every household can use it."
his experiment began with the material of filament: traditional carbon strips were used as filament, and the filament would break as soon as electricity was turned on. Ruthenium, chromium and other metals are used as the filament. After being electrified, it will burn out after a short time. The effect of using platinum filament as filament is not ideal. In this way, Edison tested more than 1600 materials. Many experts think that the future of electric light is bleak because of the tests and failures. Some famous British experts even ridiculed Edison's research as "meaningless". Some reporters also reported: "Edison's ideal has come to nothing." Edison faced failure, faced with all people's sarcasm, Edison did not retreat. He understood that failure is the mother of success, and every failure means a step closer to success.
3. It's fixed. 520
but now it's very simple. It can be passed in 5-8 minutes
4399 super robot summer fun web games
but now it's very simple. It can be passed in 5-8 minutes
4399 super robot summer fun web games
4. ... OMG is a man of course!!! Well, I'm talking about the original!! It's Shi Yukun's "seven heroes and five righteousness". In the original book, AI Hu is definitely a man! It means that what ls and ls are talking about is AI Hu in the harmful new Bao Qingtian's seven heroes and five righteousness
Hot content