The overload of a UAV when it touches the arresting net should not lager than ____.
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When determine the launch window for Halley’s Comet probe should chose: ____.
A. The annual launch window
B. The monthly launch window
C. The diurnal launch window
D. Zero window
The injection point of a spacecraft refers to ____.
A. The termination point of the thrust of the second-stage rocket engine
B. The initial position of the spacecraft into orbit
C. Apogee
D. Perigee
The black barrier area is located in ____ of the spacecraft’s return orbit.
A. Deorbit stage
B. Transition stage
C. Re-entry stage
D. Landing stage
Which following re-entry mode has the largest overload? ____
A. Purely ballistic
B. Semi-ballistic
C. Jumping
D. Gliding
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