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【单选题】
西门子MM420 变频器的主电路电源端子( )需经交流接触器和保护用断路器与三相电源连接。但不宜采用主电路的通、断进行变频器的运行与停止操作
A.
X、Y、Z
B.
U、V、W
C.
L1、L2、L3
D.
A、B、C
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