单机无穷大系统中，假设自动调节励磁装置使E',恒定，则隐极发电机的功率极限出现的功角在(  )90°处。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69516' and id < 4503576 and id<>'4503576' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69516' and id > 4503576 and id<>'4503576' order by id asc limit 5