1. College of ATM, Civil Aviation Flight University of China, Guanghan, 618300 Sichuan, China
2. Library, Civil Aviation Flight University of China, Guanghan, 618300 Sichuan, China
3. Center for Teacher Development and Teaching Evaluation, Civil Aviation Flight University of China, Guanghan, 618300 Sichuan, China
4. Academic Affairs Office, Civil Aviation Flight University of China, Guanghan, 618300 Sichuan, China
5. School of Electronic Information, Zhongyuan University of Technology, Zhengzhou, 450007 Henan, China