X62W铣床的( A )采用了反接制动的停车方法。
A. 主轴电动机M1
B. 进给电动机M2
C. 冷却泵电动机M3
D. 风扇电动机M4
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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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A. for
B. to
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A. in
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C. on
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