患者,男,30岁。饮酒后觉上腹不适,恶心, 剧烈呕吐,初为胃内容物,随后呕鲜血100ml。查体:血压120/80mmHg,脉搏95次/分,腹软, 无压痛,肝脾未及。最可能的原因是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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