问题描述：
[单选]
肺动脉口的瓣膜是：（）
A．二尖瓣
B．三尖瓣
C．主动脉瓣
D．肺动脉瓣
E．肺静脉瓣
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答案解析：无
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上一篇：关于肱动脉的描述何者错误？（）
下一篇：根据短文，判断2-8题是否正确Mary"s dream house is at the beach． It has got two floors． There is an orange living room， and a purple kitchen downstairs． A blue dining room is between them． Mary"s dream bedroom is upstairs． There is a bed， a desk， a chair and a bookcase in the bedroom． Outside the bedroom， there is a balcony． It is like a small garden with many plants．1． Mary"s dream house has got three floors． Yes or No？
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