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
32
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://www.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
Who______wascomingtoseemeinmyofficethisafternoon?A、yousaidB、didyous
Touristsweresurprisedtoseeawomandrivingahugeorangetractordownon
Someconsumerresearchersdistinguish(1)"rational"motivesand"emotional"
构件的刚度只取决于材料的机械性能,与构件的形状尺寸无关。
肠旋转不良最常见的病理表现是A.肠反向旋转 B.空肠近端膜状粘连压迫 C.腹
共用题干 HackThefirstbig-namehackersinc
关于施救费用的赔偿计算叙述错误的是( )。A.对所有施救费用都进行赔偿 B.
建设单位应当自工程竣工验收合格之日起( )日内,向工程所在地县级以上地方人民政
龙骨的功效是( ) A.平肝潜阳,镇静安神,收敛固涩 B.平肝潜阳,息风止
关于委托代理的说法中,正确的是( )。A.委托代理授权必须采用书面形式 B.
最新回复
(
0
)