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
2023-07-22
14
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、They were driven by steam engines.
B、They were pulled by animals or humans.
C、They were pulled by riders themselves.
D、There were totally unusable.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2860394.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]Welcometotoday’snewssegment,highlightingbusinessopport
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
[originaltext]W:Oh,Larry,Ihavebeenmeaningtotalktoyou.M:Hi,Jane.Wh
[originaltext]W:Oh,Larry,Ihavebeenmeaningtotalktoyou.M:Hi,Jane.Wh
随机试题
PassageFour[br]Whatdoesarulerneedifhewantstosecurethepowerin
电荷之间存在着作用力,同性电荷互相排斥,异性电荷互相吸引。
以下属于公民享有的监督权的是()A.批评建议权 B.检举、控告权 C.申诉
下列哪种脂肪酶是激素敏感性脂肪酶A.肝脂酶 B.胰脂酶 C.脂蛋白脂肪酶
在2008年8月8日至24日奥运会期间,北京市的空气质量不仅天天达标,而且有10
一般资料:求助者,女性,47岁,已婚,本科文化,公务员,处级干部。 案例介绍:
影响自尊的因素包括()。 (A)亲子行为(B)抱负水平 (C)社会比较
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
患者,女52岁,因“闭经1年,潮热、情绪波动严重失眠半年”就诊,临床诊断为“更年
的正确命名是( )。A.4,4-二甲基-2戊醇 B.2,2-二甲基-4戊
最新回复
(
0
)