题目内容

20/5t桥式起重机接通电源,扳动凸轮控制器手柄后,电动机不转动的可能原因 ( )。

A. 电动机的定子或转子回路开路
B. 熔断器FU1~FU2太粗
C. 电阻器1R~5R的初始值过小
D. 热继电器FR1~FR5额定值过小

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