2015考研英语阅读地面速度记录_大学英语阅读

2015考研英语阅读地面速度记录

　　Solid-fuel rockets, in which the fuel and oxidiser are pre-mixed into a stable, solid propellantand then packed inside the case of the rocket, are simpler, lighter and relatively safer. But oncea solid-fuel rocket is ignited, it is off like a firework and keeps going until all the fuel is burnedup. About the only way to stop it is to blow it apart. In a car, that would not do.

　　固体燃料火箭发动机的构造更简单、分量更轻，而且相对更安全。在固体燃料火箭发动机里，燃料和氧化剂被预先混合成稳定的液态推进剂，然后被塞满火箭发动机的燃料箱里。但是一旦固体燃料火箭发动机被点燃，它将象二踢脚一样发射出去并一直跑，直到全部燃料烧完为止。是它停止的几乎唯一的方法，就是将它甩掉。而在汽车上，这做不到。

　　Rubber power

　　橡胶动力

　　The hybrid design which Mr Jubb has come up with uses a solid fuel called hydroxyl-terminatedpolybutadiene, a form of synthetic rubber used to make things like aircraft tyres. It iscontained within the case of the rocket, into which is pumped a liquid oxidiser called high-testperoxide , a concentrated form of hydrogen peroxide which is relatively safe to handle.When the HTP comes into contact with a catalyst contained within the rocket, it turns intosteam and oxygen. And it does so at a high enough temperature to ignite the solid fuel. Thisprovides the added advantage of not having to build an ignition system into the rocket.