患者,男,8岁,反复黑便,呕吐咖啡色液体1月余,消瘦,腹胀,未触及肿块,血红蛋白5g/L,白细胞6.0×10⁹/L。最大诊断可能是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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