首页
登录
职称英语
[originaltext] For centuries men dreamed of achieving vertical flight, The a
[originaltext] For centuries men dreamed of achieving vertical flight, The a
游客
2024-02-14
73
管理
问题
For centuries men dreamed of achieving vertical flight, 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 the airliners of today do. 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 uses: deliver people across town, fly to and from airports, assist in rescue work, and aid in the search for missing or wanted persons.
选项
A、Helicopters have only been worked on by man since 1940.
B、Chinese children were the first to achieve flight in helicopters.
C、Helicopters were considered more dangerous than the early airplanes.
D、Some people thought they would become widely used by average individuals.
答案
D
解析
What is said about the development of the helicopter?
转载请注明原文地址:https://tihaiku.com/zcyy/3449111.html
相关试题推荐
[originaltext]W:EnglishLanguageCenter.HowmayIhelpyou?M:Yes.I’mcalli
[originaltext]W:EnglishLanguageCenter.HowmayIhelpyou?M:Yes.I’mcalli
[originaltext]W:Hello.Mr.Summerfield.Howareyoutoday?M:Verywell.Thank
[originaltext]W:Hello.Mr.Summerfield.Howareyoutoday?M:Verywell.Thank
[originaltext]M:I’dliketoorderpieandicecreamfordessert.Wouldyouwan
[originaltext]M:I’dliketoorderpieandicecreamfordessert.Wouldyouwan
[originaltext]M:I’dliketoorderpieandicecreamfordessert.Wouldyouwan
[originaltext]Withtheintroductionofradio,newspaperpublisherswondered
[originaltext]Withtheintroductionofradio,newspaperpublisherswondered
[originaltext]Withtheintroductionofradio,newspaperpublisherswondered
随机试题
【B1】[br]【B3】A、smallB、smallerC、biggerB电视的出现使世界比以前更小了。
Multiplanecameraswereacriticalinventionforearlyanimatedfilms:they_____
Thecardhadperforationsintheupperleftcorner.A、holesB、emblemsC、linesD、n
Formanypeopletoday,readingisnolongerrelaxation.Italsomeanswork.Tok
B
高处作业高度在()时,属于三级高处作业。A.≥30m B.2-5m C.5
婴儿手足搐搦症最常见的症状是A.喉痉挛 B.震颤 C.手足搐搦 D.惊厥
2020年1-10月,我国规模以上互联网和相关服务企业(简称互联网企业)完成业务
根据增值税法律制度的规定,一般纳税人的下列销售行为中,应开具增值税专用发票的是(
(2014年真题)下列土类中宜选作路堤填料的是( )。 A.粉性土 B.亚
最新回复
(
0
)