正常成人的二尖瓣瓣口面积为（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25561' and id < 2150665 and id<>'2150665' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25561' and id > 2150665 and id<>'2150665' order by id asc limit 5