三相异步电动机要稳定运行，则其转差率S应该（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32657' and id < 2596578 and id<>'2596578' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32657' and id > 2596578 and id<>'2596578' order by id asc limit 5