首页
登录
职称英语
[originaltext] I wonder how many of you would want to work in a tall buildin
[originaltext] I wonder how many of you would want to work in a tall buildin
游客
2024-02-23
64
管理
问题
I wonder how many of you would want to work in a tall building such as the Empire State Building if you had to climb 102 flights of stairs to reach the top. Not many, I imagine. If it were not for the invention of elevators, or lifts, tall buildings would be unusable.
The first lift was just a box suspended on a rope. Using a series of pulleys, a group of oxen or strong men would pull the rope and lift the box to a higher point. Lifts were used only for heavy materials, not passengers. Even in the nineteenth century, when steam power was used to operate the lifts, people didn’ t ride them. They didn’ t trust the rope that held the Box.
In 1853, Elisha G. Otis invented the first safe lift. He showed his invention in New York at the Crystal Palace Exhibition. At the exhibition, Otis was pulled up in an open box that was attached to two guide rails. When he was lifted far above the spectators, he gave the order to cut the rope. To the amazement of the crowd, the lift did not fall straight downward to the floor. Instead, it was held fast to the guide mils by a certain device. He had built powerful metal clamps on the carriage as a safety measure. The demonstration worked, end people have been riding as passengers in elevators ever since.
选项
A、Disadvantages of tall buildings.
B、Modern elevators.
C、The Crystal Palace Exhibition.
D、The invention of the elevator.
答案
D
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3476657.html
相关试题推荐
[originaltext]W:Haveaseat,Mr.Baldwin.Youhaveaveryimpressiveresume.M
[originaltext]W:Wakeup,Eric,timetoriseandshine.M:Ha,oh,hi,Jane,I
[originaltext]M:Canyoutellmewherethedean’sofficeis?W:I’monmywayt
[originaltext]M:Canyoutellmewherethedean’sofficeis?W:I’monmywayt
[originaltext]M:Canyoutellmewherethedean’sofficeis?W:I’monmywayt
[originaltext]M:Canyoutellmewherethedean’sofficeis?W:I’monmywayt
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
随机试题
Ifsomeoneyoudon’tknowissaidtobeahero,you’resurewhatkindofthingh
[originaltext]M:Helen,whydidyougiveupthejob?W:Itwastooboring.Q:
Agoodtitleforthisselectionis______.[br]Pavlovworkedwith______.A、peop
IsHeadphoneGoodforWork?A)MarissaYuworksinabusyoff
下列关于淋巴循环的主要功能,不包括()A.使血液中的红细胞生成素原转变为红细胞
锚杆杆体长度必须与设计相符,用直尺测量,长度不得小于设计长度的()。 A.
维护受试者利益,可通过以下方式予以保障,除外A.对受试者做到知情同意 B.以动
城市轨道交通线网规划的背景研究阶段主要内容包括()。A.自然 B.政策
根据城市经济学原理,下列哪项因素导致城市空间扩展是不合理的?( )A.收入增长
报检员凭检验检疫机构核发的《报检员证》办理报检手续,报检员在从事报检业务中有违反
最新回复
(
0
)