三相异步电动机在额定转速下运行时，转差率（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id < 4497243 and id<>'4497243' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id > 4497243 and id<>'4497243' order by id asc limit 5