某同学采用如图甲所示的电路测定电源电动势和内电阻已知干电池的电动势约为15v内阻约为2Ω电压表v电流表a�动变阻器有r1和r2各一 Template




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tomski某同学采用如图甲所示的电路测定电源电动势和内电阻已知干电池的电动势约为15v内阻约为2Ω电压表v电流表a�动变阻器有r1和r2各一 coloring