如图所示电路断开开关s1s2闭合开关s3灯l1与l2串串联断开开关s3闭合开关s1s2灯l1与l2并并联.——青夏教育精英家教�—— Template




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tomski如图所示电路断开开关s1s2闭合开关s3灯l1与l2串串联断开开关s3闭合开关s1s2灯l1与l2并并联.——青夏教育精英家教�—— coloring