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【多选题】
老年人缺铁的主要原因有A.
造血功能降低，血红蛋白的含量减少
B.
铁的摄入量不足
C.
铁的吸收较弱
D.
维生素B12、维生素B6及叶酸缺乏
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皮皮学刷刷变学霸
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A.
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B.
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C.
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A.
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B.
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C.
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D.
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