题目内容

The performance indicators of a rocket engine refer to the engine's : ____.

A. Thrust-weight ratio
B. Thrust
C. Impulse
D. Specific impulse

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A. Electrothermal propulsion
B. Electric current propulsion
C. Electrostatic propulsion
D. Electromagnetic propulsion

A. Control
B. Location
C. Azimuth
D. Speed

A. Distance measuring equipment (DME)
B. Inertial navigation system (INS)
C. VOR navigation system
DVOR navigation system

A. Satellite system
B. Ground station group
C. Gyroplatform
D. User equipment