Solid-fuel engines are simpler than liquid-fuel engines, ___ have important uses() A. both of them B. both C. both of which D. both all 相关知识点: 试题来源: 解析 C固体燃料发动机比液体燃料发动机简单,这两种类型的发动机都有重要用途。 [精析]C不定代词+of which(whom)引导的定语从句常...
A. whether a liquid-fuel or a solid-fuel rocket is better depends on the purpose B. neither type is superior C. forty years ago, large solid-fuel rockets with solid fuels as powerful as liquid fuels were made D. the thrust can be made to vary by adjusting the direction of the pump...
根据 The great advance in rocket theory 40 years ago showed that liquid-fuel rockets were far superior(优越) in every respect to the sky rocket with its weak solid fuel,the only kino of rocket then known可以推测出两种燃料各有优势,用途不同用法不一样,故选C。2.考查对文意的理解。It all ...
LIQUID AND SOLID FUEL BURNERComplete Patent Searching Database and Patent Data Analytics Services.doi:US1509356HUGH HUTCHINSON
A.neither type is very economicalB.the liquid-fuel rocket is bestC.each type has certain advantagesD.the solid-fuel rocket is hest 相关知识点: 试题来源: 解析 C 文中提到一些外行可能会问,相较而言liquid and solid-fuel rockets哪个更好,作者对此问题的看法是The question is meaningless,接着在文...
单项选择题Solid-fuel engines are simpler than liquid-fuel engines, ___have important uses. A.both of them B.both C.both of which D.both all 点击查看答案 延伸阅读 你可能感兴趣的试题 1.单项选择题I know it’s not important but I can’t help___about it. A.to think...
(current) are using small solid fuel rockets like Cerebrum others (7) are developing(develop) or testing reusable liquid fuel rocket engines. China's commercial space industry has expanded rapidly since 2015,when the government began encouraging private companies (8)...
NASA plans to use liquid fuel in the new project because than solid rockets boosters. A. it is less costly B. it is much safer C. it can last longer D. it is more E. nvironmentally F. riendly 相关知识点: 试题来源: 解析 B ...
A hybrid propulsion system comprises a liquid fuel section and a solid fuel section. The liquid fuel section contains an aqueous solution of hydrogen peroxide. An injector system is located between the liquid fuel section and the solid fuel section. The injector system injects a stream of ...
Fuel cell with solid fuel and liquid oxidising agent. This cell comprises a metal anode (preferably Zn) as a solid fuel, and an electrolyte serving as a liquid oxidising agent (pref. K2Cr2O7+ H2SO4). The cathode (e.g. graphite) is preferably executed in the form of a cylinder which ...