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
31
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/3449112.html
相关试题推荐
[originaltext]Bowsandarrowsareoneofman’soldestweapons.Theygaveea
[originaltext]Ihaveanannouncementtomakebeforewestartclass.I’mloo
[originaltext]Ihaveanannouncementtomakebeforewestartclass.I’mloo
[originaltext]TheCivilWarcameaboutasaresultofmanydifferencesbetw
[originaltext]M:Doyouknowwhathappenedtometoday?Iwassoembarrassed.W
[originaltext]M:Doyouknowwhathappenedtometoday?Iwassoembarrassed.W
[originaltext]M:Doyouknowwhathappenedtometoday?Iwassoembarrassed.W
Themostnoticeabletrendamongtoday’smediacompaniesisverticalintegrat
Themostnoticeabletrendamongtoday’smediacompaniesisverticalintegrat
Themostnoticeabletrendamongtoday’smediacompaniesisverticalintegrat
随机试题
[originaltext]YahooInc.,theworld’slargestInternermediacompany,andM
GeneAnalytical—theSubstituteOrganizeExaminationAblood
[originaltext]Igrewuponasteadydietofsciencefiction.Inhighschool
Becausesometeachersbelievethatmemorizationandlearningare______,theyma
关于多器官功能障碍综合征(MODS);陈述不正确的是()A.MODS发病机制复杂
下列关于变动成本计算法和完全成本计算法表述中,正确的是()。A.采用变动成本计算
后前位心脏远达片,心腰消失以至凸起见于A.正常肥胖型心脏 B.左心室增大 C
证券公司、证券投资咨询机构应当向客户提供风险揭示书,并由客户签收确认。风险揭示书
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
桥梁钻孔桩在浇筑水下混凝土时,导管下端()的深度在任何时候不得小于1m。A.进
最新回复
(
0
)