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【单选题】
对于血氧指标的说法，下述哪一项是不确切的
A.
血氧含量是指100ml血液中实际与血红蛋白结合的氧量
B.
动脉血氧分压取决于吸入气中氧分压的高低
C.
血氧容量决定于血液中Hb的浓度及Hb和02的结合力
D.
血氧饱和度的高低与血液中血红蛋白的量无关
E.
正常动、静脉血氧含量差约为5ml／dl
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