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 authors attribute each tower’ s collapse to three separate but related"loading events". 【T1】The first event was a Boeing air
The authors attribute each tower’ s collapse to three separate but related"loading events". 【T1】The first event was a Boeing air
admin
2019-05-09
41
问题
The authors attribute each tower’ s collapse to three separate but related"loading events". 【T1】
The first event was a Boeing aircraft hitting the building, cutting through the exterior structure and creating a fireball that immediately consumed some of the estimated 10, 000 gallons(38 kiloliters) of jet fuel.
The high-rises, structural systems were sufficiently redundant. However, that this major damage by itself did not cause the collapse. According to the report, " most of the load supported by the failed columns is believed to have been transferred to adjacent perimeter columns through Vierendeel behavior of the exterior wall frame".
【T2】
The second event was the continuing fire, fed both by the remaining jet fuel and the office contents of furniture and paper.
【T3】
This fire heated and weakened the structural systems, adding stress to the damaged structure.
Meanwhile, the sprinklers were not operating as designed. "Even if these systems had not been compromised by the impacts, " says the report, " they would likely have been ineffective... 【T4】
the initial flash fires of jet fuel would have opened so many sprinkler heads that the systems would have quickly depressurized and been unable to effectively deliver water to the large area of fire involvement. "
The third event was a progressive collapse: 【T5】
" As the large mass of the collapsing floors above accelerated and impacted the floors below, it caused an immediate progressive series of floor failures, punching each in turn onto the floor below, accelerating as the sequence progressed.
Freestanding exterior walls... buckled at the bolted column splice connections and also collapsed. "
【T4】
选项
答案
E机燃油引起的大火使众多的喷头开始工作,致使灭火系统水压骤然下降,难以有效地将水输送到大范围的火场。
解析
转载请注明原文地址:https://kaotiyun.com/show/A2Cd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
InAnglo-Americatherearethreemajorethnicgroups.ThefirstistheoriginalIndianpopulation,whotodayrepresentsaminori
Inthe18thcentury,NewYorkwassmallerthanPhiladelphiaandBoston.TodayitisthelargestcityinAmerica.Howtoexplain
61)Theearliertypeofsuburb,whichwasmostdependentontherailroad,hadaspecialadvantagethatcouldbefullyappreciate
Industrial【21】______doesnotjusthappen.Companies【22】______lowaccidentratesplantheirsafetyprograms,workhard
Giventhelackoffitbetweengiftedstudentsandtheirschools,itisnotsurprisingthatsuchstudentsoftenhavelittlegood
A1973SupremeCourtdecisionandrelatedSenatehearingsfocusedCongressionalcriticismonthe1966FreedomofInformationAct
Manyayoungpersontellsmehewantstobeawriter.Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdiff
ProperstreetbehaviorintheUnitedStatesrequiresanicebalanceofattentionandinattention.Youaresupposedtolookata
Floods,stormsandothernaturaleventskillthousandsofpeopleeveryyear.Sodoesextremeheat.Expertssayheatmaybenatur
随机试题
对于标底,下列说法正确的是()。
IgG的生物学活性不包括
行胆囊造影患者,检查前一日晚餐进食
《公路水运工程试验检测人员继续教育办法(试行)》的实施时间是()。
某场地中自0~1.0m为回填土,γ1=18kN/m3,自1.0m以下为黏性土,ck=15kPa,φk=18°,γ2=19kN/m3,地下水位为4.5m,基础埋深为2.5m,基础宽度为4.0m。据《建筑地基基础设计规范》(GB50007—2002),地
根据设备基础附近水准点,用水准仪测出的标志具体数值。相邻安装基准点,高差应在()以内。平面控制的坐标系统,应满足测区内投影长度变形值不大于()。
根据《中外合资经营企业法》的规定,合营企业必须由出席董事会会议的董事一致通过方可做出决议的事项有()。
A.withtimesandcircumstancesB.existinmuchgreaterclearnessC.thateveninthemassandbodyD.provideforhumanwa
(2013年真题)甲使用暴力劫取国有档案,人民法院根据我国《刑法》第329条“抢夺、窃取国家所有的档案的,处……”的规定,判决甲犯抢夺国有档案罪。本案中,法院的解释属于()。
设常数a>0,f(x)=.则()
最新回复
(
0
)