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如图所示电路滑片P移动过程中，电表的示数变化进行计算
54.如图甲所示电路中，R为滑动变阻器，R0为定值电阻，电源电压4V恒定不变（不计温度对电阻影响）。在滑片滑动过程中，电流表与电压表的示数变化如图乙所示，则根据图像信息可知
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