( )是形成各种操作技能所不可缺少的关键环节，通过对它的应用可以使个体掌握某种技能。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30614' and id < 2469435 and id<>'2469435' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30614' and id > 2469435 and id<>'2469435' order by id asc limit 5