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
39
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/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
ThestatementswhichNATO-ledforcesmadeincludeallthefollowingEXCEPT[orig
IhaveavividrecollectionofasummereveningwhenIhadtocarryoutaru
AbstractsI.ABSTRACTSA.Descriptiveabstract—【T1】_____ofworkyoucompleted
Theexistenceofghostsmaybedebated.ButtheimpactoftraditionalAsianb
2008年5月13日,某市经济技术开发区某通信公司新建厂房工程,该厂房东西
公共租赁住房租金原则上按照()同地段、同类型住房市场租金水平确定。A.适当高
奥尔波特认为,强调人对权力、影响和声望的热爱的价值观属于()价值观。A.理论型
下列无机结合料基层养护的说法,正确的是()。A.每一段碾压完成并经压实度检查合
下列不能促使医院感染患者易感性升高的因素是A.年龄 B.侵入性诊疗方法 C.
A.滑膜炎 B.附着点炎 C.小血管炎 D.关节腔炎症 E.肌炎类风湿性
最新回复
(
0
)