【名词&注释】
慢性阻塞性肺病(chronic obstructive pulmonary disease)、吸入性肺炎(aspiration pneumonia)、环状软骨(cricoid cartilage)、呼吸道并发症(respiratory tract complication)
[单选题]慢性阻塞性肺病的病人开胸术后,出现呼吸道并发症(respiratory tract complication)者可高达()
A. A.40%
B. B.50%
C. C.60%
D. D.70%
E. E.80%