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
63
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:https://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
Forthistask,youwillwritearesponsetoaquestionaboutareadingpassag
Parentingclassesareapossiblesolutiontoassistnewparentsandparents
Forthispart,youareallowed30minutestowriteanessayonpeoplelivingin
[originaltext]Mostrainforestslieclosetotheequator,wheretheclimate
晓东在和妈妈去丽江旅游的时候,对充满浓郁民族特色的纳西字画产生了兴趣。不顾妈妈的
A.头孢拉定 B.头孢他啶 C.头孢克洛 D.头孢氨苄 E.双氯西林
土工织物有效孔径分布曲线为半对数坐标。()
共用题干 资料:周先生每月的工资3000元,虽然平时收入不高,但其每年年底可获
病理性错觉的特点是()。(2011-05)A:能够进行自我校正 B:属于感知综
下面关于舌杆的描述,不正确的是A.位于下颌舌侧龈缘与舌系带、黏膜皱褶之间 B.
最新回复
(
0
)