When bidirectional swinging nozzle’s two opposite nozzles swing in the same direction, it could controls the ____ motion of the rocket.
A. Yaw
B. Pitch
C. Rolling
D. Sideslip
查看答案
Advantages of solid rocket engines over liquid rocket engines are ____.
A. Larger thrust
B. Simpler structure, more convenient to operate
C. Higher specific impulse
D. Longer working time
The specific impulse of chemical energy rocket engine can reach ____.
A. 3000 m/s
B. 5000 m/s
C. 8000 m/s
D. 10000 m/s
Which of the following engine has the highest specific impulse? ____.
A. Liquid rocket engines
B. Solid rocket engines
C. Nuclear rocket engines
D. Electrostatic rocket engine
V-2 missile is a kind of ____ missile.
Air-supported
B. Air-to-ground
C. Ground-to-air
D. Ballistic
微信支付 
支付宝支付