有一台绕线式异步电动机想调高转速，可采取下列哪一种调速方法（      ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68476' and id < 4421258 and id<>'4421258' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68476' and id > 4421258 and id<>'4421258' order by id asc limit 5