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] 【B1】
选项
答案
apparatus
解析
空格前的定冠词the和形容词mechanical提示,此处应填入名词。apparatus意为“器械”,注意双写P。
转载请注明原文地址:https://tihaiku.com/zcyy/3562042.html
相关试题推荐
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
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
随机试题
[img]2018m9s/ct_etoefz_etoeflistz_201808_0059[/img][br]Accordingtotheprofes
It’sperhapstheworld’smostfamousunderwaterattraction,immortalizedin
成熟乳
位于肩胛冈下窝中央凹陷处,约当肩胛冈下缘与肩胛下角之间的1/3折点处的腧穴是A、
有120个棱长为30cm的正方体包装盒,按图示规律堆放在长方体库房的一角,恰好全
A. B. C. D.
在气的生成过程中,尤为重要的是( )。A.肺的呼吸功能 B.脾胃运化功能
企业发行中期票据应披露企业主体信用评级和债项评级。()
建设工程质量特性中的“与环境的协调性”是指工程与( )的协调。A.所在地区社会
(2019年真题)有效控制城市发展的重要手段是( )。 A.建筑设计 B.
最新回复
(
0
)