某二叉树的前序序列为ABDC，中序序列为BDAC，则该二叉树的深度为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28853' and id < 2351157 and id<>'2351157' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28853' and id > 2351157 and id<>'2351157' order by id asc limit 5