三相负载作三角形连接，不论负载对称与否，三个线电流的相量和均为零。（    ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68474' and id < 4421122 and id<>'4421122' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68474' and id > 4421122 and id<>'4421122' order by id asc limit 5