异步电动机的转差率为零时，电动机处于堵转状态。  ()（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id < 4494948 and id<>'4494948' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id > 4494948 and id<>'4494948' order by id asc limit 5