异步电动机处于理想空载状态时，转差率s为（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id < 4497257 and id<>'4497257' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id > 4497257 and id<>'4497257' order by id asc limit 5