环状缓冲区是一种 。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30161' and id < 2440349 and id<>'2440349' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30161' and id > 2440349 and id<>'2440349' order by id asc limit 5