一只不可打开的暗箱如图虚线框内所示箱内有三个电阻器用r1r2r3表示与电源串联.abcd表示露在箱外的四根接线柱已知电源电压 Template




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tomski一只不可打开的暗箱如图虚线框内所示箱内有三个电阻器用r1r2r3表示与电源串联.abcd表示露在箱外的四根接线柱已知电源电压 coloring