患者,男,50岁。呕鲜血1天,无慢性病史;近半年来乏力。查体发现面色黑暗,巩膜无黄染;腹无压痛;腹部稍膨隆,脾大,叩诊移动性浊音(+),下肢不肿。出血病因首先考虑的是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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