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[名词解释] 首过效应

喉癌的主要病理表现是:() ["A.腺癌","B.未分化癌","C.鳞状细胞癌","D.肉瘤","E.淋巴瘤"] 射线对比度 声门型喉癌最早出现的症状是:() ["A.喉部不适感","B.咯血","C.呼吸困难","D.声嘶","E.吞咽困难"] 喉狭窄患者,手术修复喉腔后放置"T"形管的时间通常是:() ["A.1~3个月","B.3~6个月","C.6~10个月","D.1年","E.1~2年"] 喉狭窄患者气道阻塞腔径达70%~90%,按Cotton分类法应诊断为:() ["A.Ⅰ度喉狭窄","B.Ⅱ度喉狭窄","C.Ⅲ度喉狭窄","D.Ⅳ度喉狭窄","E.以上都不对"] 首过效应
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