05. 03 开放科学(资源服务)标识码(O S ID): Preventive Maintenance of Civil Aircraft and Analysis of S4000P Standard FENG Yunwen1,CHEN Junyu1,MA Xiaojun2,TENG Da1,LI Jian3 (1. School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China) (2. Science and Technology Commission...