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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