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【多选题】
The influences of wingtip trailing vortex are: ____.
A.
The efficiency of the airport
B.
The efficiency of aircraft’s take-off and landing
C.
The lift of the plane
D.
Increase the induced drag
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参考解析：
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举一反三
【单选题】Which of following belongs to passive control in the noise control of aircraft? ____.
A.
Adopting fairings
B.
Blowing control
C.
Aspirating control
D.
Plasma micro jet.
【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