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【单选题】
有关P的叙述，哪一项是错误的（）
A.
P 50 是指血红蛋白氧饱和度为50%时的氧分压
B.
P 50 是反映Hb与氧亲和力的指标
C.
P 50 的正常值为26～27mmHg
D.
P 50 降低表示氧离曲线右移
E.
P 50 升高0.1kPa可由红细胞内2，3-DPG浓度增高1mmol/gHb所致
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