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当前学科:内燃机车司机技师
题目:
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下列关于感应子电机的说法错误的是()。
A . A、铜和硅钢片铁心的利用率较低
B . B、发电机的效率低
C . C、电势波形不容易达到理想的正弦波
D . D、电机的工作频低
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