患者,男,26岁。排柏油便2天。既往无胃病及肝病史,近期无服药史。查体:血压70/40mmHg,心率120次/分,腹平软,无压痛,肝脾未及,可能性大的疾病是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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