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
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://www.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]M:HeyLinda,doyougetthatletteraboutthenewoptionsforfo
PollutedwaterisnothingnewintheUnitedStates.Wehavelivedthroughfl
我劝他放弃计划,可他不听。(invain倒装句)InvaindidItrytopersuadehimtogiveuphisplan.
系统设计是根据系统分析的结果,完成系统的构建过程。系统设计的主要内容包括(请作答
共用题干 EnergizeYourselfandYourFamilyB
下列属于支票特点的有( )。A.在银行信用基础上产生,以存款为依据 B.在银
招聘申请表的设计主要是根据()来确定。A.招聘主管 B.职务说明书 C.招
直接引起资产与权益同时增加的经济业务有()。A.发放货币性职工福利 B.
在发电厂、变电所设计中,电压互感器的配置和中性点接地设计原则,下列哪些是正确的?
必须招标范围内的各类工程建设项目的重要设备、材料等货物的采购,单项合同估算价在人
最新回复
(
0
)