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【多选题】
The main noise sources on the airframe includes: ____.
A.
Aerodynamic noises of high lift device
B.
Aerodynamic noises of landing gear
C.
Interference noises among the aircraft
D.
Jet noise of engine
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The engine suitable for hypersonic vehicles is ____.
A.
Turbojet
B.
Fanjet
C.
Propjet
D.
Ramjet