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题如图所示,电源电压保持不变,当滑动变阻器的滑片P向左滑动时,电压表V1的示数减小了△U1,电压表V2的示数增大了△U2,则( )
As shown in the figure, the power supply voltage remains unchanged. When the slide P of the sliding rheostat slides to the left, the number of voltmeters V1 is reduced by ΔU1, and the number of voltmeters V2 is increased by ΔU2. ( )