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下述哪一项不是维生素B12缺乏的常见原因()
- A、先天储存不足
- B、摄入量不足
- C、吸收和运输障碍
- D、生长发育过快
- E、药物作用
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单选题哪一项不是维生素B缺乏的原因()A
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药物抑制维生素B12的代谢作用
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