患者,男,45岁。反复上腹隐痛、腹胀10余年加重伴大便性状改变3个月,“伴食欲缺乏,消瘦,体重下降5kg,大便4〜6次/天,不成形,带黏液。化验粪便隐血试验阳性,血红蛋白100g/L。最佳诊断依据
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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