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题如图所示,电路中的 R_1和 R_2相等,滑动变阻器的滑片 P 自左端向右端滑动的过程中,AB 间的总电阻将( )
As shown in the figure, R_1 and R_2 in the circuit are equal. During sliding of the slide P from the left end to the right end of the sliding rheostat, the total resistance between AB will be ()