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【单选题】
成人男性正常红细胞和血红蛋白数值是A.
（3.5～5.0）×1012/L、110～150g/L
B.
（6.0～7.0）×1012/L、70～200g/L
C.
（4.0～5.5）×1012/L、120～160g/L
D.
（5.0～7.0）×1012/L、110～200g/L
E.
（3.5～7.0）×1012/L、110～200g/L
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A.
it provides a perfect solution to mass unemployment
B.
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