题目内容
心室肌动作电位O期去极化是由于膜对哪种离子通透性增高（）
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心室肌动作电位不同于神经纤维的主要特征是（）
III. For Part 3 (para.7)True or FalseOur civilization is more advanced than other alien civilizations according to the joke.
We have not been contacted by an alien civilization because of the insufficient development of the science and technology.
The author has had sufficient evidence to prove that the joke is wrong.
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