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
68
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:http://tihaiku.com/zcyy/2832845.html
相关试题推荐
[originaltext]Somepeoplehaveverygoodmemories,andcaneasilylearnqui
[originaltext]Somepeoplehaveverygoodmemories,andcaneasilylearnqui
[originaltext]Whentheautomobilewasfirstinvented,fewpeoplethoughtof
[originaltext]InordertomanwinBritain,boththemanandthewomanmust
[originaltext]InordertomanwinBritain,boththemanandthewomanmust
[originaltext]M:Oh,Ken,Ihavebeenmeaningtotalktoyou.W:Hi,Denise!Wh
[originaltext]M:Oh,Ken,Ihavebeenmeaningtotalktoyou.W:Hi,Denise!Wh
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
随机试题
ThistalkcoverseachofthefollowingtopicsEXCEPT______[originaltext]T
下列关于污水深度处理,哪项说法正确?()A.用于污水深度处理的滤池滤料,粒径
(2017年)下列单位不属于消费税纳税人的是( )。A.委托加工应税消费品的单位
《巴塞尔协议Ⅲ》进一步提高了监管资本的最低要求,一级资本充足率提高至()。A.
血站违反有关操作规程和制度采集血液,应由哪一部门对其责令改正?A.县级以上地方
B(更多真题可到国家公务员考试网下载)此题考查数量类。第一段图形中面的个数分别为0、1、2,第二段图形中面的个数分别为2、3,选有4个面的,因此选B。
邪热袭表的脉象特征是()A.浮数脉 B.浮滑脉 C.浮紧脉 D.弦滑
革兰阴性杆菌对β-内酰胺类药物耐药的主要机制是A.青霉素结合蛋白的改变B.药物作
Thechangeinthatvillagewasmiraculou
联系实际,说说什么样的老师受学生欢迎。
最新回复
(
0
)