我国标准规定加速器等中心指示的检定周期为

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29413' and id < 2395079 and id<>'2395079' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29413' and id > 2395079 and id<>'2395079' order by id asc limit 5