三相异步电动机定子的作用是产生旋转磁场。            

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id < 4421201 and id<>'4421201' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id > 4421201 and id<>'4421201' order by id asc limit 5