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【单选题】
以下说法正确的是（）。
A.
电流互感器和电压互感器二次均可以开路
B.
电流互感器二次可以短路但不得开路，电压互感器二次可以开路但不得短路
C.
电流互感器和电压互感器二次均不可以短路
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