首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、The fuel is cheap. B、They can be stopped and reignite. C、They are cheap to build. D、They must be used soon after fueling. CWhi
A、The fuel is cheap. B、They can be stopped and reignite. C、They are cheap to build. D、They must be used soon after fueling. CWhi
admin
2010-01-26
52
问题
The great advance in rocket theory 40 years ago showed that liquid-fuel rockets were far superior in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known. However, during the last decade, large solid-fuel rockets with solid fuels about as powerful as liquid fuels have made their appearance, and it is a favorite layman’s question to inquire which one is "better". The question is meaningless; one might as well as ask whether a gasoline or a diesel engine is "better". It all depends on the purpose. A liquid-fuel rocket is complicated, but has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited when desired. A solid-fuel rocket, on the other hand, is rather simple in construction, though hard, to build when a really large size is desired. But once you have a solid-fuel rocket, it is ready for action at a very short notice. A liquid-fuel rocket has to be fueled first and can not be held in readiness if or very long after it has been fueled. However, once a solid-fuel rocket has been ignited, it will keep burning. It can’t be stopped and reignited whenever desired. Because a solid-fuel rocket can be kept ready for a long time, most military missiles employ solid fuels, but manned space flight needs the fine adjustments that can only be provided by liquid-fuel rocket. It may be added that a liquid-fuel rocket is an expensive device; a large solid-fund rocket is, by comparison, cheap.
选项
A、The fuel is cheap.
B、They can be stopped and reignite.
C、They are cheap to build.
D、They must be used soon after fueling.
答案
C
解析
Which of the following statements is NOT the characteristic of liquid-fuel rockets?文中最后一句话“a liquid-fuel rocket is an expensive device.”故选C。
转载请注明原文地址:https://kaotiyun.com/show/9CdK777K
0
大学英语六级
相关试题推荐
DearSir,Muchtomyregret,Iwritethislettertocomplainaboutyourcompany’sbaddeliveryservice.Thelaptop(Mode
A、15dollars.B、20dollars.C、25dollars.D、50dollars.C对话中女士问男士她要付多少钱,男士回答这周该商品在促销,它们已经降到了25美元。
Whatshouldyoudoifyoudiscoveryou’rebeingscammed(诈骗)?Thefirstthingistostopallcontactwiththescammer(诈骗者).It’
A、Hedressesmoreformallynow.B、Whathewearsdoesnotmatchhisposition.C、Hehasignoredhisfriendssincegraduation.D、He
Whatissaidabouttheactualityofthepoliticalleadershipstructure?Inthelastparagraphofthepassage,the"communityre
A、Hewasn’tofferedthejobinthebookstore.B、Hereallywantstoworkinthebookstore.C、Hedidn’tknowwherethebookstorew
Forthispart,youareallowed30minutestowriteashortessayentitledOnAgingPopulation.Youshouldwriteatleast150wor
Thechiefreasonforthepopulationgrowthis______(与其说是出生率的上升,还不如说是死亡率的下降).
Thereistimewhenjobseekerssimplywortelettersofapplication."Justputdownyourname,【B1】______,ageandwhetheryouha
A、Shedoubtshemakesmuchmoneynow.B、She’ssurprisedthathehadchosenthatcompany.C、Shedoesn’tknowwhenherclassessta
随机试题
A.IL-2B.IFN-rC.IL-4D.G-CSFE.IL-10具有抗病毒感染功能的因子是()
组织最重要的是()。
任何原因的损害均可引起面神经传导阻滞与瓦勒变性,依其程度由轻到重可分为
女,50岁。3个月前被自行车把撞伤上腹部,近3周来上腹隆起,进食后上腹胀满伴恶心、呕吐。查体:上腹部扪及18cm×13cm囊性肿块,钡餐透视见横结肠下移。最可能的诊断是
护理重症哮喘病人哪几项不正确
既能反映投资中心的投入产出关系,又可使个别投资中心的利益与企业整体利益保持一致的考核指标是()。
下列各组词语中没有错别字的一组是______。
解放战争时期中国共产党制定的土地改革文献有
Tomanyweb-buildingspiders,mostof【C1】______arenearlyblind,thewebistheiressentialwindow【C2】______theworld:thei
A、CreatingAbstractExpressionism.B、Paintingpeopleandanimals.C、Sponsoringanewartmovement.D、Exploringrealisticmethods
最新回复
(
0
)