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
The opinion of many engineers is that the architects that designed the New York World Trade Center Twin Towers did a good job in
The opinion of many engineers is that the architects that designed the New York World Trade Center Twin Towers did a good job in
admin
2017-04-21
94
问题
The opinion of many engineers is that the architects that designed the New York World Trade Center Twin Towers did a good job in designing the buildings. The buildings were safe from the hazards envisioned at the time. Indeed, they were designed to withstand the force of aircraft that might crash into them. They were not, however, designed to withstand the effects of the very high temperatures generated by the ignition of tons of aviation fuel carried by the aircraft.
Steel lightly covered with concrete is the main structural component of the towers and steel loses a lot of structural strength when heated to 1,100 degrees Centigrade and beyond, as it was. To shield the steel the towers beams were coated with a few centimeters of concrete. That insulation was to provide structural integrity for at least 1 hour of fire. The towers met that test. The south tower lasted 62 minutes. The north, 103 minutes. Tragedy followed when not all could escape prior to the collapse.
Most experts agree that the Twin Towers were very well-designed. Many also agree that the people planning the attacks were very knowledgeable and aimed the aircraft at a height that would effect the most damage. The aircraft crash and the resulting fuel fed fires were aimed at about the 90th floor. That was just high enough to insure that the upper floors would weaken with the heat and crack down, dropping into the remaining part of the building.
The mass of the falling top floors created such a falling load that some experts estimate it exceeded by 5 to 10 times normal bearing loads. The effect was like a giant hammer, each floor contributing more weight to be born by the next floor down.
Were the Trade Towers well designed? Engineers say yes. But the public believes that architects will never again design a tall building without considering the effects of terrorist attacks of all potential kinds. That not only includes the ability of the structure to withstand attack but the means to allow the buildings occupants to escape in time to survive.
The part of the building below 90th floor______.
选项
A、was immune to the attack
B、was chosen as the attack aim
C、cracked down because of fire
D、was hammered down by the falling upper part
答案
D
解析
本题是推理题。从文中第4段“…the effect was like a giant hammer,each floor contributing more weight to be born by the next floor down.”可以得出,飞机撞至顶层,撞击力像一把锤子,向下面的每层施压下去。由此可以推断:90层以下的楼层是被上层塌下的部分重砸下来的。
转载请注明原文地址:https://kaotiyun.com/show/x89d777K
本试题收录于:
BFT阅读题库国际化人才外语考试(BFT)分类
0
BFT阅读
国际化人才外语考试(BFT)
相关试题推荐
Youareaskedtowriteacompositioninwhichyougiveyourownopinionsonthefollowingtopic:
HereisaletterwhichcomplainsaboutthequalityoftheTVsetboughtinastore.Readtheletterandcompletethegiveninfor
HereisanadvertisementaboutaBusinessBookClub.Readtheadvertisementandcompletethegiveninformationform.Wri
Readthefollowingstatement:Onlyunderofficiallawsoradministrativeregulationscanwedefendastableandreliableexa
HereisanadvertisementaboutforacertainpositioninthenewspaperofDec.7,2005.Readtheadvertisementandcompletethe
HereisanadvertisementaboutforacertainpositioninthenewspaperofDec.7,2005.Readtheadvertisementandcompletethe
Lookatthefollowingadvertisement.ChinaDailyWewouldliketohearyouropinionsaboutthe
Readthefollowingletterandcompletethegiveninformationform.Writeaword,phraseornumberinthespaces1-5.De
Youareaskedtowriteacompositioninwhichyougiveyourownopinionsonthefollowingstatement.Face-to-facecommunicat
TheopinionofmanyengineersisthatthearchitectsthatdesignedtheNewYorkWorldTradeCenterTwinTowersdidagoodjobin
随机试题
关于急性硬膜外血肿CT表现的描述,正确的是
填入下面横线处,与上下文衔接最恰当的一句是()对爱好文科的学生,加强文科辅导是必要的,但是否可以忽视理科的学习呢?还要不要他们学好数学、物理、化学和生物呢?______。
患者,男,42岁。4年来经常腹胀,下肢浮肿,前胸有蜘蛛痣,腹水,肝未触及,脾大。应首先考虑的是
以滑膜炎为基本病理改变的风湿病是
检验试验费属于()。
下列关于股票及股票基金的说法错误的是()。
用人单位自用工之日起满1年不与劳动者立书面劳动合同的,视为用人单位自用工之日起满1年的当日已经与劳动者立无固定定期限劳动合同。()
何冀平《天下第一楼》
设f(x)是奇函数,除x=0外处处连续,x=0是其第一类间断点,则∫0xf(t)dt是
Atwhattimedoestheofficeopen?
最新回复
(
0
)