Civil aviation aircraft communication system. According to the inquiry of official website of Beihang University, as of July 10, 2023, the courses offered by Beihang University include "Innovation and Entrepreneurship Foundation", "Career Planning for College Students" and "General Russian for College Students", and the course with the highest failure rate is "Civil Aviation Aircraft Communication System", with the failure rate reaching 79%. Beihang University, referred to as Beihang University for short, is located in Beijing, the capital, and is a national key university directly under the Ministry of Industry and Information Technology of the People's Republic of China.