【名词&注释】
心理障碍(psychological obstacle)、思想观念(ideological concept)、适宜性(suitability)、医务人员(medical staff)、信息内容(information content)、中间环节(intermediate link)、病原学诊断(etiological diagnosis)、不适当(inadequacy)、手术刀(scalpel)、呼吸道感染病原学(pathogens in respiratory infection)
[单选题]下呼吸道感染病原学(pathogens in respiratory infection)诊断(etiological diagnosis)中,痰细菌定量培养分离病原菌数为()
A. ≥102cfu/ml
B. ≥103cfu/ml
C. ≥104cfu/ml
D. ≥105cfu/ml
E. ≥106cfu/ml