如图6所示的电路图中电源电压未知，R0是阻值已知的定值电阻。开关

如图6所示的电路图中电源电压未知，R₀是阻值已知的定值电阻。开关S闭合后，能够测算出未知电阻R_X阻值的电路是（）

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如图6所示的电路图中电源电压未知，R0是阻值已知的定值电阻。开关

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