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如何用一个电压表和一个已知电阻来测量未知电阻的阻值.小红设计了如图所示的电路图.实验时,已知R1为40Ω,在闭合S的情况下,断开开关S1时电压表的示数是2.0V,闭合S1时电压表的示数是2.8V.整...
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