下列问题中，哪些属于三相异步电动机的缺点？（ ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30223' and id < 2444873 and id<>'2444873' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30223' and id > 2444873 and id<>'2444873' order by id asc limit 5