31．用电流表和电压表测�属丝的电阻时按如图所示的电路进行测量利用该电路进行实验的主要操作过程是第一步先将r2的�动头调到最左端 Sketch Coloring Page

31．用电流表和电压表测�属丝的电阻时按如图所示的电路进行测量利用该电路进行实验的主要操作过程是第一步先将r2的�动头调到最左端 Template

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三、实验：用电压表测电压 sketch template

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