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【单选题】
如图11—18所示，M是理想变压器， 是交流电流表， 是交流电压表．当次级电路(副线圈)中的开关S合上时（ ）
A.
电流表的读数减小
B.
电流表的读数增大
C.
电压表的读数增大
D.
电压表的读数减小
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