如图所示仪器中常用两个阻值不同的可变电阻来调节电路中的电流一个作粗调一个作细调.已知r1>r2则图a中用作粗调的是r1r1图b Template




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tomski如图所示仪器中常用两个阻值不同的可变电阻来调节电路中的电流一个作粗调一个作细调.已知r1>r2则图a中用作粗调的是r1r1图b coloring