异步电动机的可变损耗有（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30223' and id < 2444887 and id<>'2444887' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30223' and id > 2444887 and id<>'2444887' order by id asc limit 5