如图所示电路闭合开关�现两灯泡均不亮.于是小文用一根导线检查故障.�闭合开关将导线连接在ab之间�现两灯不亮�闭合开关将导线连在b Template




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tomski如图所示电路闭合开关�现两灯泡均不亮.于是小文用一根导线检查故障.�闭合开关将导线连接在ab之间�现两灯不亮�闭合开关将导线连在b coloring