三相笼型异步电动机的调速方式包括（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69328' and id < 4488242 and id<>'4488242' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69328' and id > 4488242 and id<>'4488242' order by id asc limit 5