题目内容
The most important part to control the thrust of the liquid rocket engine is the ____.
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The thrust of solid rocket engine can be controlled by ____.
When bidirectional swinging nozzle’s two opposite nozzles swing in the same direction, it could controls the ____ motion of the rocket.
Advantages of solid rocket engines over liquid rocket engines are ____.
The specific impulse of chemical energy rocket engine can reach ____.
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