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【多选题】
The thrust direction of rocket engine could be control by: ____.
A.
Valve
B.
Secondary injection technology
C.
Swinging nozzle
D.
Jetavator
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】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
【多选题】Solid rocket engines generally are using on: ____.
A.
Sounding rockets
B.
Air-to-air missiles
C.
Rocket boosters
D.
Main engine of space shuttle
【单选题】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