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当前学科:动物生理学
题目:
单选
心室肌有效不应期长短主要取决于:()
A . 动作电位0期去极的速度
B . 动作电位2期的长短
C . 阈电位水平的高低
D . 动作电位3期的长短
E . 钠--钾泵功能
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