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【单选题】
正常人骨髓中,比值为A.
1 ∶ 1
B.
3 ∶ 1
C.
5 ∶ 1
D.
2 ～ 4 ∶ 1
E.
3 ～ 5 ∶ 1
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A.
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B.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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E.
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