题目内容
心室肌细胞出现超常期的原因是（ ）
2021-10-17
A.3期复极化速度快，兴奋性增高
B.阈电位水平下移，兴奋性增高
C.膜电位靠近阈电位，所需的刺激阈值小于正常
D.Ca2+内流加快，平台期持续时间缩短
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