题目内容

电动机转速提不起来的原因是重绕时（）。

A. 进入杂物
B. 未烘干
C. 匝数过多
D. 匝数过少

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A. the wounded had nothing wrong with his head
B. the injury was not serous
C. the injury happened at the mast head
D. a sailor injured at his head

A. 高风险性；不稳定性
B. 低风险性；不稳定性
C. 高风险性；稳定性
D. 低风险性；稳定性