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【单选题】
如图所示,T为理想变压器,副线圈回路中的输电线ab和cd的电阻不可忽略,其余输电线电阻可不计,则当电键S闭合时()
A.
交流电压表V 1 和V 2 的示数一定都变小
B.
交流电压表只有V 2 的示数变小
C.
交流电流表A 1 、A 2 和A 3 的示数一定
D.
只有A 1 的示数变
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