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【单选题】
电机连续运转PLC控制的主电路，下列说法正确的是
A.
电机连续运转PLC控制时，不需要连接主电路
B.
电机连续运转PLC控制时， 需要连接主电路，主电路中不需要交流接触器。
C.
电机连续运转PLC控制时， 需要连接主电路，主电路需要交流接触器。
D.
电机连续运转PLC控制时，主电路和传统的接触-继电器控制电路的主电路不同。
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