The mean duration of operation was 38min;
手术时间平均38分钟；
Chronic bronchitis, type of operation, duration of operation, pulmonary function and PCA are risk factors of PI in esophageal and cardiac cancer patients.
食管癌及贲门癌手术后医院感染的危险因素包括术前合并慢支炎、手术方式、手术持续时间、肺功能和术后PCA。
Currently the Civil Aviation of China is in the duration of operation system transition, and the enterprise strategic management concept has just been introduced.
中国的民航业正处于转换经营机制的过程中，企业的战略管理才刚刚起步。
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