首页
登录
职称英语
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese
游客
2024-04-19
48
管理
问题
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upwards and fell back to earth as rotation ceased. Leonardo da Vinci con ceive the first mechanical【B1】______,called a "Helix," which could carry man straight up, but was only a design and was never tested.
The ancient-dream was finally realized in 1940 when a Russian engineer piloted a strange look ing craft of steel tubing with a rotating fan【B2】______.It rose awkwardly and verti cally into the air from a standing start,hovered a few feet above the ground,went【B3】______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. Peo ple anticipated that vertical flight transports would carry millions of passengers as do the airliners of today. Such fantastic expectations were not【B4】______.
The helicopter has now become an extremely useful machine. It【B5】______in military missions, carrying troops, guns and【B6】______ instruments where other air craft cannot go. Corporations use them as airborne offices, many metropolitan areas use them in po lice work, construction and logging companies employ them in various【B7】______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【B8】______crews and supplies. Any urgent mission toa hard-to-get-to placeisa likely task for a helicopter.Among their other【B9】______of use:deliver people across town,fly to and from airports,【B10】______ rescue work, and aid in the search for missing or wanted persons. [br] 【B6】
选项
答案
strategic
解析
此处需要名词、形容词或分词作定语,修饰名词instruments。strategic意为“战略的”。
转载请注明原文地址:https://tihaiku.com/zcyy/3562047.html
相关试题推荐
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
随机试题
Atschoolandatwork,Ihavenoticedthatpeoplehavedifferentkindsofwo
四大名著(theFourGreatClassicalNovels)是指罗贯中的《三国演义》(RomanceoftheThreeKingdo
如果你告诉他们真相,你就可以获得这次机会而不被他们误解。(without)Ifyoutellthemthetruth,youwillbeabl
Themodemsocietyhaswitnessedamazingdevelopmentinastrology.Inrecentyear
下列关于建筑装饰玻璃使用方法的说法,正确的有()。A.双面弹簧门应在可视高度部
对平等主体的公民、法人和其他组织之间发生的合同纠纷和其他财产权益纠纷作出裁决是(
中枢神经系统内脑脊液产生速度为A.0.4~0.6ml/min B.0.3~0.
下列各项中,属于不能在资产评估委托合同中约定的内容有( )。 A.对应纳入评
A.减弱,紫光 B.减弱,红光 C.增强,紫光 D.增强,红光
某大型工程,由于技术特别复杂,对施工单位的施工设备及同类工程的施工经脸要求较高
最新回复
(
0
)