某完全二叉树按层次输出（同一层从左到 右）的序列为ABCDEF。该完全二叉树的前 序遍历序列为 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29840' and id < 2421826 and id<>'2421826' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29840' and id > 2421826 and id<>'2421826' order by id asc limit 5