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
2023-07-13
33
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、They are used for rescue work.
B、They are taking the place of highflying jets.
C、They have been widely used for various purposes.
D、They are now used exclusively for commercial projects.
答案
C
解析
How has the use of helicopters developed?
转载请注明原文地址:https://tihaiku.com/zcyy/2832846.html
相关试题推荐
[originaltext]M:Iwouldliketwoticketsforthe9o’clockshowthisevening.
[originaltext]M:Iwouldliketwoticketsforthe9o’clockshowthisevening.
[originaltext]M:Iwouldliketwoticketsforthe9o’clockshowthisevening.
[originaltext]M:Iwouldliketwoticketsforthe9o’clockshowthisevening.
[originaltext]Onewinterdayin1891,aclassatatrainingschoolinMassa
[originaltext]Onewinterdayin1891,aclassatatrainingschoolinMassa
[originaltext]Notmanyyearsago,awealthyandratherstrangeoldmanname
[originaltext]Notmanyyearsago,awealthyandratherstrangeoldmanname
[originaltext]W:CanIhelpyou,sir?M:Yes,(19)Iwaswantingsomewheretost
[originaltext]W:CanIhelpyou,sir?M:Yes,(19)Iwaswantingsomewheretost
随机试题
Theauthorcitestheexampleofthe16-year-oldAlbanianhigh-schooldrop-outto
Forthispart,youareallowed30minutestowriteacompositiononthetopicMy
为什么说以公有制为主体、多种所有制经济共同发展,是我国社会主义初级阶段的一项基本
左心房扩大的早期X线征象是()A.左前斜位左主支气管受压抬高 B.后前位左心缘
冰雪天气时,检查设备积雪、覆冰厚度情况,及时清除构架上形成的冰柱。
关于福费廷业务的特点,下列说法正确的有()。A:属于中期融资业务 B:适合于1
下列计量单位中,属于建筑施工单位产品人工时间定额的单位是( )。A.小时 B
(2017年真题)下列安全出口的检查结果中,符合现行国家消防技术标准的有(
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
不宜采用强夯法施工的是()。A.高饱和度的粉土 B.碎石土 C.杂填土 D
最新回复
(
0
)