题目内容

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

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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

The “Spirit” Mars pathfinder from the US has adopted ____ soft landing.

A. Landing leg type
B. Airbag bounce type
C. Aerial crane type
D. Rocket thrust

Nowadays computer and computer technology has completed ____ of the work in aircraft design and manufacture.

A. More than 50%
B. More than 60%
C. More than 70%
D. More than 80%