一台同步发电机作单机运行，供给一电阻电感负载，若改变其励磁电流，则此发电机输出的无功功率（ ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id < 4421403 and id<>'4421403' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id > 4421403 and id<>'4421403' order by id asc limit 5