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
28
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/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
"Hightech"and"stateoftheart"aretwoexpressionsthatdescribethemod
WhoKilledtheSeaLions?A)Sittingintheturbulent(汹涌的
Mostmeetingshaveanagenda.Foraformalmeeting,thisdocumentmaybehan
宏观经济分析的资料来源包括()。 Ⅰ.部门和企业的原始记录 Ⅱ.主管公
可引起出血性大肠炎,并能引起致死性并发症最常见的大肠埃希菌是A.O139B.O5
患者,女性,35岁。自述在机关工作,因经常加班、出差和应酬,家人对其不能理解。该
()、专责监护人应始终在工作现场,对工作班人员的安全认真监护,及时纠正不安全的行
某安全等级为二级的高层建筑采用钢筋混凝土框架结构。柱截面尺寸900mm×900m
有关易化扩散的特征错误的是A.不消耗能量 B.有饱和状态 C.具有结构特异性
(2018年真题)某烟花爆竹生产企业建设项目安全设施未经验收擅自投入生产,被当地
最新回复
(
0
)