Which of following are right about the flap: ____.
A. Only opens when aircraft takes off
B. Only opens when aircraft lands
C. Opens when aircraft takes off and lands
D. Is a high lift device of aircraft
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Corresponding auxiliary landing measures could use during landing process of airplane are: ____.
A. Open the drag parachutes
B. Open the air brake
C. Using arrester hook
D. Using thrust reverser
The launch modes of UAV including: ____.
A. Zero-length launch
B. Carrier-borne air launch
C. Vertical take-off
D. Throwing launch
The UAV of landing and recovery methods including: ____.
A. Helicopter aerial recovery
B. "sky hook" recovery
C. Parachute recovery
D. Tail hook arresting recovery
The conditions should be considered when determine the launch window include: ____.
A. Preparation situation of carrier rocket
B. The ground observation and tracking condition
C. Orbit operation requirement
D. Return location
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