题目内容
关于等容舒张期,错误的是( )
2021-10-17
A.该期开始时,半S -关闭,并产生第二心音
B.心室内压迅速下降至小于房内压
C.无血液流入或流出心室
D.在一个心动周期中此期心室容积最小
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