RL并联电路，两条支路电流有效值分别为3A 和4A，则总电流有效值为(    )。   

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id < 4420840 and id<>'4420840' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id > 4420840 and id<>'4420840' order by id asc limit 5