单选题:关于Hb与O2结合的叙述.哪一项不正确(  )

题目内容:
关于Hb与O2结合的叙述.哪一项不正确(  ) A.1分子Hb可以结合4分子O2
B.100ml血液中,Hb所能结合的最大O2量称为Hb氧含量
C.HbO2呈鲜红色,氧离Hb呈紫蓝色
D.Hb与O2合或解离曲线呈S形
E.Hb4个亚单位间有协同效应
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