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
50
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
•Readthearticlebelowaboutabankwithareputationforexcellence.•Choose
Thespottedbowerbirdhasa(i)______foramassingthebrightshinyobjectsitne
Thatcustomerwantedtoreturnthepensheboughtbecausehesaidthey______ea
[originaltext]NikkiCatsouras,the18-year-oldwoman,waskilledinacarc
ADoseofRealityMajorRealityCheckWhent
某企业在确定产品产量指标时采取盈亏平衡分析法,盈亏平衡示意图见下图。该企业201
妄想性障碍的特点包括()多选A.妄想内容有一定现实性 B.个别患者有幻觉症状
阻塞性睡眠呼吸暂停综合征的临床表现中不包括A.睡眠打鼾及憋气 B.极度日间嗜睡
根据企业所得税法律制度的规定,关于在中国境内未设立机构、场所的非居民企业取得的来
(2021年真题第1批)招标人下列行为中,属于以不合理条件限制、排斥潜在投标人或
最新回复
(
0
)