固定拴固点应为封闭型结构，防止（）从栓固点脱出。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='25759' and id < 2164561 and id<>'2164561' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25759' and id > 2164561 and id<>'2164561' order by id asc limit 5