用电设备一般允许电压偏移为(    )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69458' and id < 4498244 and id<>'4498244' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69458' and id > 4498244 and id<>'4498244' order by id asc limit 5