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【单选题】
在等容收缩期，心脏各瓣膜的功能状态是（）
A.
房室瓣开放，半月瓣开放
B.
二尖瓣关闭，三尖瓣开放
C.
房室瓣关闭，半月瓣关闭
D.
房室瓣关闭，半月瓣开放
E.
房室瓣开放，半月瓣关闭
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