男性,46岁。大便带血1年,呈滴状,色鲜红。便秘或饮酒后便血更甚。胸膝位检查:肛门外观有皮赘。诊断首先考虑内痔。检查时内痔的表现特征是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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