碳素结构钢Q235-A .  F中的F表示（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24889' and id < 2124321 and id<>'2124321' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24889' and id > 2124321 and id<>'2124321' order by id asc limit 5