开始冲压操作前，操作者应事先确认已经做好以下哪些事项？（ ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30404' and id < 2457977 and id<>'2457977' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30404' and id > 2457977 and id<>'2457977' order by id asc limit 5