同步发电机抑制高次谐波电动势的方法有（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id < 4497204 and id<>'4497204' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id > 4497204 and id<>'4497204' order by id asc limit 5