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国际上对于民用飞机的环保要求很严格,其中就有对飞行噪声的要求。请问影响飞机噪声的主要因素是什么,降噪的关键技术有哪些?飞机的气动声学上应进行怎样的考虑?
The international environmental requirements for civil aircraft are very strict, of which there is a requirement for flight noise. What are the main factors that affect aircraft noise, what are the key technologies for noise reduction? What should be considered about the aerodynamic performance of aircraft?