题目内容

最易发生晕厥和心绞痛的是

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

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His _____ and unwillingness to learn from others prevent him from being an effective member of the team.

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