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【单选题】
(42~44题共用题干)患者,男性,46岁,咳嗽、咳痰半年余,近期出现血痰,体重明显下降,胸部叩诊呈浊音。该听诊音形成的机制,应除外的是( )A.
气管、支气管黏膜充血水肿、分泌物增加
B.
支气管平滑肌痉挛
C.
管腔内异物或肿瘤部分阻塞
D.
管壁外肿大组织压迫致支气管管腔狭窄
E.
气流通过稀薄分泌物时,所产生的水泡破裂音
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