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【多选题】
如图所示为理想变压器，电表均可视为理想电表，原线圈接线柱接电压u＝311sin314t（V）的交流电源。当滑动变阻器的滑片P向下滑动时，下列说法正确的是：（）A.
A 1 示数变小
B.
A 2 示数变小
C.
A 1 示数不变
D.
V 2 示数变大
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