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【单选题】
左心室等容收缩期，指的是
A.
心室射血开始至射血终止时间
B.
心室射血开始至射血达峰值时间
C.
心室射血的峰值至射血终止时间
D.
房室瓣关闭至半月瓣开放的间期
E.
心电图Q波起点至心室射血起始点的间期
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