单项选择题

B1型题 S1亢进,P2亢进的疾病是()

A.二尖瓣狭窄
B.二尖瓣关闭不全
C.肺动脉瓣狭窄
D.主动脉瓣狭窄
E.主动脉瓣关闭不全