男,58岁,反复上腹痛5年,近期出现纳差、早饱、消瘦、食欲减退,服用胃药疗效差。下列哪项是检查时病变最可能的部位,应重点观察()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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