三相异步电动机的铁心采用彼此绝缘的硅钢片叠成的目的是（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69467' and id < 4499386 and id<>'4499386' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69467' and id > 4499386 and id<>'4499386' order by id asc limit 5