单选题:慢性支气管炎患者呼吸道感染时,最常致病的革兰荫性杆菌为

题目内容:
慢性支气管炎患者呼吸道感染时,最常致病的革兰荫性杆菌为 A.肺炎克雷白杆菌
B.流感嗜血杆菌
C.大肠杆菌
D.变形杆菌
E.绿脓杆菌
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