异步电动机按定子相数分为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30223' and id < 2444867 and id<>'2444867' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30223' and id > 2444867 and id<>'2444867' order by id asc limit 5