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问题 单项选择题

当柴油机超速安全装置发生作用后，（）。

A.重新启动柴油机

B.先使超速安全装置复位，再启动柴油机

C.先排除故障、后复位，再重新启动柴油机

D.更换超速安全装置

答案

参考答案：C

判断题

三相异步电动机的机械特性是指定子电压和频率为定值时，电磁转矩T和输出功率P之间的关系。
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单项选择题

Generally speaking，in the Northern Hemisphere，when winds are blowing from between SE and SW the barometric reading（）.

A.makes no change at all

B.is somewhat lower than it would be for winds from a northern quadrant

C.is uncertain and may fluctuate by increasing and decreasing

D.is somewhat higher than it would be for winds from the northern quadrant
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