异步电动机采用降压启动的方法有（  ）？（2.0）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id < 4494928 and id<>'4494928' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id > 4494928 and id<>'4494928' order by id asc limit 5