交流电动机按其作用原理又分为同步电动机和异步电动机。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id < 4421199 and id<>'4421199' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id > 4421199 and id<>'4421199' order by id asc limit 5