Electric rocket engines, according to the different ways of accelerating working medium, can be divided into: ____.
A. Electrothermal propulsion
B. Electric current propulsion
C. Electrostatic propulsion
D. Electromagnetic propulsion
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Navigation could provide information about: ____.
A. Control
B. Location
C. Azimuth
D. Speed
Which of following belong to radio navigation technology? ____.
A. Distance measuring equipment (DME)
B. Inertial navigation system (INS)
C. VOR navigation system
DVOR navigation system
Satellite navigation system is mainly composed: ____.
A. Satellite system
B. Ground station group
C. Gyroplatform
D. User equipment
Image matching navigation technology is suitable for: ____.
A. Whole accurate navigation
B. Terminal guidance
C. Integrated navigation
D. Terrain clearance and terrain avoidance
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