皮皮学,免费搜题
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搜题
【单选题】
等容舒瓣膜的状态是
A.
房室瓣和半月瓣都开放
B.
房室瓣开放,半月瓣关闭
C.
房室瓣和半月瓣都关闭
D.
房室瓣关闭,半月瓣开放
E.
肺动脉瓣开放,主动脉瓣关闭
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