air breathing engines造句

例句与造句

1. Types of air breathing engines proposed for spaceplanes include scramjet, liquid air cycle engines, precooled jet engines, pulse detonation engine and ramjets.
2. However, being an air breathing engine ( unlike a conventional rocket ) there is a penalty for taking on-board air from the atmosphere.
3. A corollary of this is that, particularly in air breathing engines, it is more energy efficient to accelerate a large amount of air by a small amount, than it is to accelerate a small amount of air by a large amount, even though the thrust is the same.
4. However, air breathing engines are usually very much heavier than rocket engines and the empty weight of the oxidizer tank, and since, unlike oxidizer, this extra weight ( which is not expended to add kinetic energy to the vessel, as is propellant mass ) must be carried into space it may offset the overall system performance.
5. It's difficult to find air breathing engines in a sentence. 用air breathing engines造句挺难的