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如图所示电路中,R1、R2为定值电阻,电源内阻为r.闭合电键S,电压表显示有读数,调节可变电阻R的阻值,电压表示数增大量为ΔU,则在此过程中 A.可变电阻R阻值增大,流过它的电流增大 B.电阻R2两端的电压减小,变化量等于 C.通过电阻R2的电流减小,变化量小于 ...