患者男性,50岁,左上腹撞伤伴腹痛4小时。伤后曾呕吐1次,为少量胃内容物,无血液。体检:神志清,血压100/76mmHg,脉搏88次/分钟,上腹部有压痛、反跳痛及肌紧张,移动性浊音(—),腹腔穿刺(—)。腹部平片示:两侧膈下有游离气体。考虑最可能为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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