异步电动机的转差率S<0时，电机运行于（）状态。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32657' and id < 2596584 and id<>'2596584' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32657' and id > 2596584 and id<>'2596584' order by id asc limit 5