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【多选题】
下 面 有关心动周期叙述 正确的是A.
心房和心室每收缩和舒为一个心动周期；
B.
左 心房和 右心房 每收缩和舒为一个心动周期；
C.
当心率加快时，心动周期缩短，尤其以舒缩短更为明显 ;
D.
心动周期是指心脏机械活动的周期 .
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