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
70
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
WhatisArt?I.DifferentOpinionsonArt—Artmakesusmorethoughtfuland【T1】
Ineverycityandtowntherearcpeoplenamedas【S1】______realesta
Knowledgemaybeacquiredthroughconversation,watchingtelevisionortrave
Nodirectrelationshiphasbeenprovenbetweenhighcholesterollevelsandheart
YouwillfindarestaurantforeverysituationintheU.S.Ifyouareina
资产运营能力指企业资产及其组成要素在生产过程中的运营能力。分析指标主要包括(
过量使用会出现惊厥的药物是()。A.地西泮 B.氯丙嗪 C.咖啡因 D.苯
下列有关我国能源分布的说法正确的是()。A、石油资源主要分布在中国西南地区
盾构法施工用于穿越地面障碍的给排水主干管道工程,直径一般( )mm以上。A.3
男,65岁。患再生障碍性贫血2年,多次输血治疗。最近2次输血过程中出现发热,体温
最新回复
(
0
)