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【单选题】
小儿极重度贫血时，其血红蛋白和红细胞数值是 血红蛋白 红细胞数（）A.
90～60g／L（3～2）×10 12 ／L
B.
60～30g／L（2～1）×10 12 ／L
C.
50～70g／L（5～4）×10 12 ／L
D.
40～30g／L（3.5～2.5）×10 12 ／L
E.
＜30g／L＜1×10 12 ／L
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举一反三
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B.
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A.
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A.
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