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
31
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
TheUniversityLibraryisoneofthelargest【B1】______librariesinthecou
资产评估原则包括( )两个层面。A.工作原则 B.经济技术原则 C.合法性原
如遇个别客人不愿进入导游员安排的购物商店,导游员合理的处理方法是( )。A.告
在经济较不发达的阶段,政府往往更强调产业布局的()。A:超前性 B:滞后性
用强心苷治疗慢性心功能不全,其对心脏的作用属于A.吸收作用 B.选择性作用
复方硼砂溶液含硼砂、碳酸氢钠、酚和甘油,本品在制备和存放时可产生气泡,其原因为A
放射性元素镭的发现者是() A、波尔B、赫兹C、居里夫妇D、瓦特
谁是谁的人”是久居官场的人常说的话,假如你所在的单位有某种圈子,有人直接或间接地
下列说法中,正确的是( )。A.大赦既赦其刑,又赦其罪B.特赦只赦其刑
根据政府采购法律制度的规定,下列关于公开招标的表述中,正确的是()A.地方
最新回复
(
0
)