同步发电机电枢绕组的作用是（    ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69508' and id < 4502958 and id<>'4502958' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69508' and id > 4502958 and id<>'4502958' order by id asc limit 5