电力系统通常是由发电机、(    )用户等组成的三相交流系统。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421646 and id<>'4421646' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421646 and id<>'4421646' order by id asc limit 5