为解决电网功率因数过低的问题，一般使同步电动机工作在（    ）状态。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id < 4421421 and id<>'4421421' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id > 4421421 and id<>'4421421' order by id asc limit 5