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【单选题】
大咯血是指２４小时内咯血量A.
１００ml以上
B.
２００ml以上
C.
３００ml以上
D.
４００ml以上
E.
５００ml以上
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A.
钠通道已基本复活
B.
膜电位绝对值低于静息电位
C.
阈电位水平下移，膜电位与阈电位水平差距减小
D.
钠通道已基本复活，而膜电位低于静息电位
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