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【单选题】
三相鼠笼式异步电动机满载运行时,当发生转子局部断条后,将会产生的现象是( )。
A.
转速上升，声音异常
B.
产生强烈火花
C.
转速下降，声音异常，电流表指针来回摆动
D.
转速不变，声音异常
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