如图所示电路闭合开关s后灯泡l1�光电压表和电流表均有示数但灯l2不亮这可能是 A.灯l2的灯丝断了或灯l2与灯座未接通b Template




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tomski如图所示电路闭合开关s后灯泡l1�光电压表和电流表均有示数但灯l2不亮这可能是 a.灯l2的灯丝断了或灯l2与灯座未接通b coloring