异步电动机的定、转子铁心用相互绝缘的0.35或0.5毫米厚的硅钢片叠成，是为了（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id < 4497293 and id<>'4497293' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id > 4497293 and id<>'4497293' order by id asc limit 5