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
9
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、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://www.tihaiku.com/zcyy/2884959.html
相关试题推荐
[originaltext]M:Hey,Karen.Youarenotreallyreadingit,areyou?W:Pardon?
[originaltext]M:Hey,Karen.Youarenotreallyreadingit,areyou?W:Pardon?
[originaltext]M:Hey,Karen.Youarenotreallyreadingit,areyou?W:Pardon?
[originaltext]W:Pleasehaveaseat,MrSuanders.Ireceivedyourresumelastw
[originaltext]W:Pleasehaveaseat,MrSuanders.Ireceivedyourresumelastw
[originaltext]Therearebetween3,000and6,000publiclanguagesinthewor
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]Youshouldnotfearspidersbecauseoftheirpoison.Ofallt
[originaltext]Youshouldnotfearspidersbecauseoftheirpoison.Ofallt
[originaltext]Youshouldnotfearspidersbecauseoftheirpoison.Ofallt
随机试题
Thebiggestsafetythreatfacingairlinestodaymaynotbeaterroristwith
闭经诊断步骤中孕激素试验阳性表示A.应进一步进行雌激素试验 B.子宫内膜受一定
下列关于病毒性肝炎的流行病学资料中哪项是错误的A.甲型肝炎最重要的传染源是急性肝
A.肾气丸 B.调肝汤 C.固阴煎 D.归肾丸 E.六味地黄丸治疗肝肾亏
容闳在《西学东渐记》中写道:“战争之起……以此粗笨之农具,而能所向无敌,逐北追奔
办公室的工作人员陪同客人外出,在乘车的座位上,要坐在客人的()。A.左边 B
2021年1—4月份,全国规模以上工业企业实现营业收入37.78万亿元,同比增长
在资本市场上,投资银行有义务为证券创造一个流动性较强的二级市场,并维持市场价格的
下列企业生产计划中,属于执行性计划的是( )。A.企业的1周生产计划 B.企
易诱发急性胰腺炎的是( )。A.增强CT B.B超 C.X线经皮肝穿刺胆道
最新回复
(
0
)