Nozzles that capable of implementing thrust vectoring technology includes: ____.
A. Binary thrust vectoring nozzle
B. Axisymmetric thrust vectoring nozzle
C. Adopts baffle behind the nozzle
D. Steerable vertical take-off and landing nozzle
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Compared with piston engines, the main advantages of turboshaft engines are: ____.
A. Low fuel consumption
B. High power
C. Light weight
D. Low noise
Normal flying height of a spacecraft is ____.
A. 0~20Km
B. 20~50Km
C. 20~100Km
D. Higher than 100Km
Aircraft lighter than air lifts off by ____.
A. Static buoyancy generated by air
B. Aerodynamics
C. Hot air
D. Helium
The main difference between rotorcraft and helicopter is that ____.
A. They have different fuselages
B. They have different rotor
C. They have different way to drive the rotor
D. If their rotor can generate lift or not
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