正确使用气体钢瓶的原则是：（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30403' and id < 2457854 and id<>'2457854' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30403' and id > 2457854 and id<>'2457854' order by id asc limit 5