首页
登录
职称英语
[originaltext] I wonder how many of you would went to work in a tall building
[originaltext] I wonder how many of you would went to work in a tall building
游客
2023-07-31
22
管理
问题
I wonder how many of you would went 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 ox strong men would pull the rope end 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 mils. When he was lifted far above the spectators, he gave the order to cat 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 rails by a certain device. He had built powerful metal clamps on the carriage as a safety measure. The demonstration worked, and 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/2884958.html
相关试题推荐
[originaltext]Ifyouvisitabigcityanywhereintheworld,youwillproba
[originaltext]M:Hey,Karen.Youarenotreallyreadingit,areyou?W:Pardon?
[originaltext]W:Pleasehaveaseat,MrSuanders.Ireceivedyourresumelastw
[originaltext]Therearebetween3,000and6,000publiclanguagesinthewor
[originaltext]Therearebetween3,000and6,000publiclanguagesinthewor
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]Youshouldnotfearspidersbecauseoftheirpoison.Ofallt
[originaltext]Youshouldnotfearspidersbecauseoftheirpoison.Ofallt
随机试题
Anewlaptopcostsabout_____ofasecond-handone.A、thepriceofthreetimesB
管理自我实现人假设观点正确的有()A.需要层次理论中自我实现的需要 B.麦格
点彩红细胞胞质中的颗粒为A.残存变性的DNAB.残存变性的RNAC.残存变性的脂
《Q/GDW1168-2013输变电设备状态检修试验规程》规定,220kV油浸式
站用交流电源柜应能耐受不超过()的短路电流所产生的热应力和电动力,应通过保
SF6气体有哪些良好的灭弧性能?
某企业注册资金为3500万元,本年年初资产总额4000万元,年末资产总额达到45
标准化的()必须保证评分的客观性。A.投射测试 B.人格测试 C.兴趣测试
下列有关审计计划的说法中,正确的是()。A.制定总体审计策略的过程通常在具体审
对胃癌引起的大出血,其处理是A.选择性迷走神经切除术十幽门成形术 B.内科保守
最新回复
(
0
)