试题与答案

第一心音形成的主要机制是()。 A. * * 肌的收缩 B.房室瓣开放 C.二尖瓣和三尖瓣

题型:单项选择题 A1/A2型题

题目:

第一心音形成的主要机制是()。

A. * * 肌的收缩

B.房室瓣开放

C.二尖瓣和三尖瓣关闭

D.心室壁的震动

E.半月瓣关闭

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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