女性,67岁,周期性上腹部疼痛10年,进食后比空腹疼痛明显。近半年来疼痛减轻,但变为持续性隐痛,黑便2个月。胃镜活检诊断为癌,患者手术标本最可能表现为()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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