有一台四极三相绕线式异步电动机，要使转速增加，下列哪种调速方法可行?（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69328' and id < 4488244 and id<>'4488244' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69328' and id > 4488244 and id<>'4488244' order by id asc limit 5