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【单选题】
有关左心室的描述，哪一项是正确的?A.
左房室瓣为二尖瓣
B.
以二尖瓣前，分为流出道与流入道
C.
流出道出口为主动脉口
D.
有两组乳头肌与瓣叶相连
E.
主动脉瓣下方有一漏斗形肌性流出道
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