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某同学利用如图甲所示的电路进行电阻的测量，他选定了以下实验器材： 待测电阻Rx（阻值约为30Ω）；变阻箱R（0～999Ω）、电源E（10V、1Ω）、多用电表、单刀单掷开关S1和单刀双掷开关S2、导...
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高三下学期物理《》真题及答案
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