题目内容
缺铁性贫血患者服用铁剂治疗后，出现黑便的原因是
2022-01-26
A.引起肠黏膜破溃出血
B.引起上消化道出血
C.腐蚀肠壁血管引起出血
D.铁剂在肠道细菌作用下生成硫化铁所致
E.腐蚀胃血管引起出血
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