Scene matching navigation belongs to ____.
A. One-dimensional matching navigation
B. Two-dimensional matching navigation
C. Three-dimensional matching navigation
D. Four-dimensional matching navigation
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China's HQ-2 Surface-to-Air Missile is a ____ missile.
A. Beam-riding guidance
B. CLOS guidance
C. Non-CLOS guidance
D. Infra-red homing guidance
The core component of television homing guidance is ____.
Automatic pilot
B. The head
C. Radar search equipment
D. Infrared receiver equipment
Which of the China’s spacecraft has the longest flight distance by now? ____.
A. Chang'e-1
B. Chang'e-2
Chang'e-3
D. Chang'e-4
Generally speaking, while keep the performance, providing that the aircraft can be reduced by 1 Kg in structure, the total weight of the aircraft can be reduced by ____.
A. 2-3 Kg
B. 3-5 Kg
C. 4-6 Kg
D. 5-7 Kg