问题
判断题
当转子在第一临界转速以下发生动静摩擦时，对机组的安全威胁最大，往往会造成大轴永久弯曲。
答案
参考答案：对
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当转子在第一临界转速以下发生动静摩擦时，对机组的安全威胁最大，往往会造成大轴永久弯曲。
参考答案：对
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| 1 the future can be difficult. There are many famous predictions 2 never came true. Before 1929, there was no sound in movies. The head of one of the 3 movie companies in the United States predicted that no one would want to see actors 4 . Of couse, he was wrong! In 1979, the head of the largest computer company in the United States said, "No one will want to have a computer in his or her home." He thought that computer would never 5 by most people. | |||
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