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
48
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、Steel cables.
B、Guide rails.
C、An open carriage.
D、Strong ropes.
答案
B
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3476659.html
相关试题推荐
[originaltext]W:Haveaseat,Mr.Baldwin.Youhaveaveryimpressiveresume.M
[originaltext]W:Haveaseat,Mr.Baldwin.Youhaveaveryimpressiveresume.M
[originaltext]W:Haveaseat,Mr.Baldwin.Youhaveaveryimpressiveresume.M
[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]M:Canyoutellmewherethedean’sofficeis?W:I’monmywayt
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
随机试题
从来就没有完美的幸福。人类不存在尽善尽美的状况。无论幸福还是别的什么东西,它既不在于拥有也不在于实现,而是在于追求的过程。我们要时刻牢记,我们与生俱来的
Someconsumerresearchersdistinguish【C1】______"rational"motivesand"emot
[A]ample[B]combinations[C]directly[D]disseminated[E]genera
Theenemyarenowinaverydifficultsituation:theycanneitheradvancenor___
[originaltext]W:Hello,StanfordGroup.ThisisTinaspeaking.HowcanIhelpy
[originaltext]Inrecentyears,BillGateshasgivenfinancialsupporttoimprov
住宅小区规划中影响工程造价的主要因素有()。A.容积率和建筑群体的布置形式
看涨期权也称为()。A.买权 B.认涨期权 C.认购期权 D.多头期权
在大规模的抽样调查中,很有必要采用的调查方法是()。A.分层抽样 B.系统抽
《房屋建筑与装饰工程工程量计算规范》(GB50854-2013)对以下措施项目详
最新回复
(
0
)