一台并联于无穷大电网的同步发电机，保持有功功率不变，减小励磁电流，发现其电枢电流减小，则发动机原来的运行状态为（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69465' and id < 4499089 and id<>'4499089' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69465' and id > 4499089 and id<>'4499089' order by id asc limit 5