题目内容
The thrust-to-weight ratio of rocket engines could reaches ____.
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____ is a kind of the chemical energy rocket engines.
The most important part to control the thrust of the liquid rocket engine is the ____.
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.
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