同步发电机输出有功功率恒定，改变（      ）可以调节其无功功率。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id < 4421154 and id<>'4421154' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id > 4421154 and id<>'4421154' order by id asc limit 5