一台异步电机运行时转差率s=-2说明该电机工作于（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id < 4497240 and id<>'4497240' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id > 4497240 and id<>'4497240' order by id asc limit 5