A．闭合S1，调节R1到电流表满偏，闭合S2，调节R2到电流表半偏，读出R2的阻值

       B．闭合S1，调节R1到电流表满偏，闭合S2，调节R1到电流袁半偏，读出R2的阻值

       C．闭合S1、S2，调节R1到电流表满偏，调节R2到电流表半偏，读出R2的阻值

       D．闭合S1、S2，调节R2到电流表满偏，调节R1到电流表半偏，读出R2的阻值

  • 答案
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