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
2024-04-14
17
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 conceive 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 looking craft of steel tubing with a rotating fan【B2】______. It rose awkwardly and vertically 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. People 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 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【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 to a hard-to-get-to place is a 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] 【B9】
选项
答案
multitude
解析
空格前的their other提示此处应填入名词。multitude意为“大量”,这里表示直升机的其他很多用途。
转载请注明原文地址:https://tihaiku.com/zcyy/3555429.html
相关试题推荐
[originaltext]Today,ChineseAmericansmakeuplessthan1%oftheU.S.pop
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
随机试题
SummaryListentothepassage.Forquestions26—30,completethenotesusingno
Whetheryou’relookingforaquietplaceoraholidaytrip,Florida’snatural
Arapidmeansoflong-distancetransportationbecameanecessityforthe
下列关于双胍类药物的描述,错误的是A、减慢葡萄糖在肠道的吸收 B、降低胰岛素与
某上市公司发送认购邀请书启动非公开发行股票。根据《上市公司非公开发行股票实施细则
以下关于时间价值的描述,正确的有()。 Ⅰ.极度虚值期权的时间价值通常
下列关于流水施工的说法中,反映建设工程非节奏流水施工特点的有( )。(2010年
房地产经纪行业自律管理框架体系主要包括( )。A.推广房地产经纪业务合同文本
(2020年真题)从事期货中间介绍业务的证券公司应当每()向中国证监会派出机构
基础心理学是研究()。 (A)正常成人心理现象的心理学基础学科 (B
最新回复
(
0
)