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当前学科：临床执业医师
题目：
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患者，男，70岁。40年前行胃大部分切除术，发现贫血1年。粪便隐血试验（—）。胃镜：吻合口炎症。与患者贫血无明显关系的因素是（）
A
叶酸缺乏
B
维生素B
12
缺乏
C
胃蛋白酶缺乏
D
胃酸缺乏
E
铁缺乏
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