The new rocket uses a special kind of ___ to achieve high speed. A. fuel B. energy C. power D. strength 相关知识点: 试题来源: 解析 A。“fuel”主要指燃料,“energy”泛指能量,“power”侧重权力、动力,“strength”指力量。火箭使用的是“fuel”燃料来实现高速。反馈 收藏 ...
Rocket Fuel Shortage May Be Serious in a Year;18 Months Needed to Replace PlantKathy Sawyer
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24.(fuel)are used to power the rocket.25.The boy has a good(imagine).He canthink of many ideas.26.Istay up)late last night to get readyfor the exam.27.We all know Edison had lots of(invent)during his life.28.It's too dark here.Turnthe light,please. 相关知识点: 试题来源: ...
.A rocketengine carries everything it needs.That is why a rocket engine works in space,where there is no air.There are two main types of rocket engines.Some rockets use liquid fuel.The main engines on thespace shuttle orbiter(轨道飞行器)use liquid fuel.The Russian Soyuz(联盟号)uses liquid...
Ultimately, this is because of the enormous amount of energy stored in the propellants required to make a rocket fly. Ground support personnel need to exercise great care even when dealing with “safe” propellants, such as the classic combination of kerosene and liquid oxygen. On the other end...
Since solid-fuel rockets can’t technically be throttled, [Joe] originally tried to time the ignition time of the descent motor in such a manner that it would burn out as the rocket touches down. The ignition time and exact thrust numbers simply weren’t repeatable enough, so in his 2020...
They could be used as fuel. If we do this on Mars, energy from the sun might be used as a catalyst (催化剂). The idea will also make space travel more eco-friendly. “If the CO2-based fuel could be used in...
5 Makesuretoaskforwhatyouwantinadirect,respectfulmanner.Thiswilleliminate(消 除)theneedforcriticism. ·Considertheotherparty?sperspective.Ifyoucriticizeotherstoooften,youmaybeshutting outtheotherperson?spointofview.Trytostepinanotherperson?sshoesbeforecriticizingandyou maygetsomenewandspecialideas. A.Givefee...
Elementary concepts from general physics and thermodynamics have been used to analyze rocket propulsion. Making some reasonable assumptions, an expression for the exit velocity of the gases is found. From that expression one can conclude what are the desired properties for a rocket fuel....