电机运行时发出沉闷声是电机在正常运行的声音。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='27221' and id < 2260176 and id<>'2260176' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27221' and id > 2260176 and id<>'2260176' order by id asc limit 5