同步发电机输出有功功率一定时，转子磁场与定子旋转磁场轴线的相对位置是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id < 4497159 and id<>'4497159' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id > 4497159 and id<>'4497159' order by id asc limit 5