男性,35岁,剑突下隐痛3年,与饮食有关,间有黑便,实验室检查:HGB75g/L,WBC5.9×109/L,PLT130×109/L,MCV65fl,MCHC29%,肝功能正常,贫血的可能原因是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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