The vortex lift generated by the leading-edge vortex can reach ____ of the total lift.
A. More than 10%
B. More than 20%
C. More than 30%
D. More than 40%
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Which of following belongs to passive control in the noise control of aircraft? ____.
Adopting fairings
Blowing control
C. Aspirating control
D. Plasma micro jet.
The engine suitable for hypersonic vehicles is ____.
A. Turbojet
B. Fanjet
C. Propjet
D. Ramjet
The expansion stroke of a piston engines is ____.
A. Intake
B. Compression
Combustion
D. Exhaust
The most basic type of air jet engine is ____.
A. Turbojet
B. Fanjet
C. Propjet
D. Ramjet
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