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
考研
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upward
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upward
admin
2012-08-24
93
问题
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upwards and fell back to earth as rotation ceased. Leonardo da Vinci conceive the first mechanical apparatus, called a "Helix," which could carry man straight up, but was only a design and was never tested.
The ancient-dream was finally realized in 1940 when a Russian engineer piloted a strange looking craft of steel tubing with a rotating fan on top. It rose awkwardly and vertically into the air from a standing start, hovered a few feet above the ground, went sideways and backwards, and then settled back to earth. The vehicle was called a helicopter.
Imaginations were fired. Men dreamed of going to work in their own personal helicopters. People anticipate that vertical flight transports would carry millions of passengers as do the airliners of today. Such fantastic expectations were not fulfilled.
The helicopter has now become an extremely useful machine. It excels in military missions, carrying troops, guns and strategic instruments where other aircraft cannot go. Corporations use them as airborne offices, many metropolitan areas use them in police work, construction and logging companies employ them in various advantageous ways, engineers use them for site selection and surveying, and oil companies use them as the best way to make offshore and remote work stations accessible to crews and supplies. Any urgent mission to a hard-to-get-to place is a likely task for a helicopter. Among their other multitude of used: deliver people across town, fly to and from airports, assist in rescue work, and aid in the search for missing or wanted persons.
Where is the engineer who realized the ancient-dream from?
选项
A、China
B、Italy
C、Canada
D、Russia
答案
D
解析
由第二段第一句可知,这个工程师是俄罗斯人。故答案为D。
转载请注明原文地址:https://kaotiyun.com/show/Mnhi777K
0
在职申硕(同等学力)英语
相关试题推荐
ItisunderstoodthatthefilmingofLegendsisalmostcompleteandthefilmisnot______tobedelayed.
IfyoureadCanadianEnglishDictionaries,youAcertainlyfindbothAmericanandBritishspellingsBlisting,andthefirstword
Andreaallowedthehitchhikertotakearideinhercar,mainlybecause______Andreasuddenlystoppedthecarbecause______
Accordingtothepassage,thevolunteers______.Accordingtothelastparagraph,thetypicalvolunteernowmaybe______.
Parentscannomorebefriendstotheirchildrenthanteacherscanbetotheirstudents.Fortheessenceoffriendshipisrecipr
Parentscannomorebefriendstotheirchildrenthanteacherscanbetotheirstudents.Fortheessenceoffriendshipisrecipr
Man:Peterlooksveryupsetrecently.Woman:Yes.Ithinkthathehasahardenoughjobtomakeendsmeet.Question:Whatdoesthe
Man:Hello?I’dliketwoseatsforthisevening’sshow.Woman:Sorry,buttheperformanceisalreadysoldout.Wouldyoubei
Laundryis,afterall,justlaundry.Exceptwhenit’snot.AndProcter&GambleCo.recentlyrealizedthatTide,itssegment-dom
Hispoorperformancemaybeattributedtothelackofmotivation.
随机试题
A.合体滋养细胞合成的一种糖蛋白激素,妊娠8~10周血清浓度达最高峰B.合体滋养细胞合成的单链多肽激素C.甾体激素,主要来自胎盘及卵巢D.合体滋养细胞分泌,动态监测可评判胎盘功能E.合体滋养细胞产生,灭活缩宫素受体耐热性碱性磷酸酶
霍乱患者肾功衰竭的主要机制是
下列可能导致普通商品住宅价格下降的因素是()。假设2800元/m2是2002年5月的均衡价格,此时供给量与需求量同时增加,且需求增加量大于供给增加量,则到2003年5月,达到新的均衡时均衡价格可能是()。
根据《基本农田保护条例》的规定,基本农田保护实行()的方针。
某建设单位领取了施工许可证,但因故不能按期开工,应当向发证机关申请延期,延期()。
汉译英:“曼谷”,正确的翻译为( )。
投保人申报被保险人年龄不真实,并且其真实年龄不符合合同约定年龄限制的,在合同成立后的两年内,保险人有权( )。
A公司为一综合性的生产企业,增值税一般纳税人,适用增值税税率17%。2008年6月发生的下列事项,请按业务顺序分析流转税的处理(计算过程及结果四舍五入保留两位小数):(1)当月按分期收款合同应取得销售款60000元,月底仍未支付;(2)2008年1
为客观反映我国电子商务发展状况,国家统计局服务业统计司利用企业“一套房”平台,通过联网直报的方式,对30.8万家企业的电子商务情况进行了调查。2012年,调查的30.8万家企业电子商务交易额为28825.2亿元,比上年增长17.6%(按可比口径
闪光临界融合频率是人眼对光刺激()的指标
最新回复
(
0
)