题目内容
下列关于心室处于等容收缩期的叙述，正确的是
2021-12-28
A.大动脉压低于心室内压
B.房内压高于室内压
C.房室瓣处于开放状态
D.房室瓣关闭，半月瓣处于开放状态
E.房室瓣和半月瓣均处于关闭状态
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