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Signs of birth. Since the middle of the 20th century, technology has grown faster and faster. It was only six and a half years since the discovery of uranium fission in January 1939 to the first atomic bomb exploded in July 1945. The emergence of electronic computers has led to more profound changes in the fields of human social life. These technological breakthroughs can be called technological revolutions
The train dispatcher of the railway bureau issued the driving order, and the other contents should not be filled. If incorrect text is not allowed to be altered, should be rewrote after the circle. Use the common traffic scheduling command phrase (see attachment 2), and use no words or phrases to ring out the item number. In the case of any error or omission, the dispatched order must be cancelled and re-issued.
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