首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、Disadvantages of tall buildings. B、Modern elevators. C、The Crystal Palace Exhibition. D、The invention of the elevator. D
A、Disadvantages of tall buildings. B、Modern elevators. C、The Crystal Palace Exhibition. D、The invention of the elevator. D
admin
2010-09-10
42
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、Disadvantages of tall buildings.
B、Modern elevators.
C、The Crystal Palace Exhibition.
D、The invention of the elevator.
答案
D
解析
转载请注明原文地址:https://jikaoti.com/ti/JdAFFFFM
0
大学英语四级
相关试题推荐
A、Atanexhibition.B、Attheoffice.C、Atafashionshow.D、Atagallery.A从信息词exhibitionhalls,theFair可知答案。
A、Loneliness.B、Isolation.C、Reproduction.D、Entertainment.B文章的最后一部分直接提到,为了解决熊猫的isolationproblem而建立了“BambooCorridors",因此答案是B。
A、EconomicconditionsarebetterinBritainthaninotherEuropeancountries.B、Britainwon’taccepteurosuntilthereareenoug
Tothecasualobserverwhotravels,themostvisibletravelandtourismindustryemployeesarethoseholdingentry-leveljobsin
Tothecasualobserverwhotravels,themostvisibletravelandtourismindustryemployeesarethoseholdingentry-leveljobsin
BasictoanyunderstandingofCanadainthe20yearsaftertheSecondWorldWaristhecountry’simpressivepopulationgrowth.F
TherearemanyreasonswhyfamilylifeinBritainhaschangedsomuchinthelastfiftyyears.The【B1】______ofwomenintheearl
随机试题
B665型牛头刨床工作台上平面的平面度在任意300mm测量长度上的公差为0.028mm。()
如何理解孙中山的三民主义学说?
A、Keepacoolheadinthefirstplace.B、Tellthemiftheylieagain,theywillbepunished.C、Punishtheirchildren.D、Tellthe
老年男性,70岁,既往有风心病病史,因突发全腹剧烈疼痛5小时来诊,查体:血压100/60mmHg,心率130~150次/分,律不齐,腹胀,无明显腹肌紧张如患者逐渐出现腹膜炎表现而行急诊手术治疗,则术中可能发现
背景资料:某城市高架桥上部结构为钢筋混凝土顸应力简支梁,下部结构采用独柱式T形桥墩,钻孔灌注桩基础。灌注混凝土桩时,为了防止桩顶混凝土不密实,根据实际情况,项目部技术人员分析的可能原因有:①超灌高度不够;②商品混凝土浮浆较多;
根据《税务行政处罚听证程序实施办法(试行)》的规定()。
为置换、修理或矫正因设计错误、铸造或原材料缺陷而造成的被保险机器本身的缺点错误所支付的费用,应由()承担。
甲公司从事房地产开发经营业务,对出租的商品房、土地使用权和商铺均采用成本模式进行后续计量。2018年度发生的有关交易或事项如下(不考虑增值税因素):资料一:1月1日,因商品房滞销,董事会决定将两栋商品房用于出租。1月20日,甲公司与乙公司签订租赁合同并将
食品感官检验中定量分析的方式包括()
Write-upofPresentations1DemandGenerationisthebasisofallmarketingcampaigns!Youwilllearncreativemethodsofdemand
最新回复
(
0
)