同步电动机的功率因数可以调节，过励时功率因数（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id < 4497160 and id<>'4497160' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id > 4497160 and id<>'4497160' order by id asc limit 5