.感应电动机正常工作时的转速略低于同步转速。                       

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id < 4421457 and id<>'4421457' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id > 4421457 and id<>'4421457' order by id asc limit 5