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A、移動滑動變阻器的滑片,改變了連入電路的電阻,改變了電路中的電流,符合題意.B、實驗中電阻的阻值不變,移動滑動變阻器的滑片,改變了電路中的電流,根據U=IR,電阻不變,電流變化,所以被測電阻兩端的電壓變化…
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