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单项选择题

风湿性心瓣膜病最易发生的瓣膜病变是（ ）
A 二尖瓣狭窄
B 二尖瓣关闭不全
C 主动脉瓣关闭不全
D 主动脉瓣狭窄
E 肺动脉瓣狭窄

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相关考题

单项选择题
对于拨法叙述错误的是( ) A.
着力点拇指、肘尖、掌根 B.
平行于肌腱或肌腹 C.
不可以直接拨动压痛点 D.
用于各种伤科的痛症 E.
有止疼、松解粘连的作用
问答题
Choose the best response.
Peter: （   1  ）
Julia: That's hard to say. There were both good things and bad things about the two cities. Peter: （   2  ）
Julia: Traffic, for one. The traffic in Paris was pretty bad, and the traffic in London was even worse. Peter: （   3  ）
Julia: Well, forget it. Let's talk about the good things. Peter: （   4  ）
Julia: The art galleries in Paris are fantastic. And the Louvre is amazing. Peter: （   5  ）
A. I love the galleries in London, but I like the ones in Paris even more.
B. Wait a minute! What are the bad things?
C. So it was really a wonderful trip. Which city did you like better, Paris or London?
D. That's true. All big cities have bad traffic.
E. OK.
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单项选择题
a-氨基酸晶体以內盐形式存在，同时带有正电荷和负电荷，称为两性离子或偶极离子。
A、正确
B、错误
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