About "Minuteman III", which of following are true? ____.
A. It is intercontinental missile
B. It is ballistic missile
C. The third stage adopts solid rocket engine
D. It has a firing range of more than 12,000 kilometers
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The thrust direction of rocket engine could be control by: ____.
A. Valve
B. Secondary injection technology
C. Swinging nozzle
D. Jetavator
Solid rocket engines generally are using on: ____.
A. Sounding rockets
B. Air-to-air missiles
C. Rocket boosters
D. Main engine of space shuttle
The performance indicators of a rocket engine refer to the engine's : ____.
A. Thrust-weight ratio
B. Thrust
C. Impulse
D. Specific impulse
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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