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【简答题】
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刷刷题刷刷变学霸
举一反三
【单选题】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
【多选题】The launch orbits of spacecraft include: ____.
A.
Direct orbit injection
B.
Ballistic orbit injection
C.
Sliding orbit injection
D.
Transition orbit injection