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
When an eight-lane steel-truss-arch bridge across the Mississippi River in Minneapolis collapsed during the evening rush hour on
When an eight-lane steel-truss-arch bridge across the Mississippi River in Minneapolis collapsed during the evening rush hour on
admin
2017-06-11
53
问题
When an eight-lane steel-truss-arch bridge across the Mississippi River in Minneapolis collapsed during the evening rush hour on August 1st 2007, 13 people were killed and 145 were injured. There had been no warning. The bridge was 40 years old but had a life expectancy of 50 years. The central span suddenly gave way after the gusset plates that connected the steel beams buckled and fractured, dropping the bridge into the river.
【R6】______The St Anthony Falls bridge, which opened on September 18th 2008 and replaces the collapsed structure, should do just that. It has an embedded early-warning system made of hundreds of sensors. They include wire and fibre-optic strain and displacement gauges, accelerometers, potentiometers and corrosion sensors that have been built into the span to monitor it for structural weaknesses, such as corroded concrete and overly strained joints.
【R7】______Another example is the six-lane Charilaos Trikoupis bridge in Greece, which spans the Gulf of Corinth, linking the town of Rio on the Peloponnese peninsula to Antirrio on the mainland. This 3km-long bridge, which was opened in 2004, has roughly 300 sensors that alert its operators if an earthquake or high winds warrant it being shut to traffic, as well as monitoring its overall health. These sensors have already detected some abnormal vibrations in the cables holding the bridge.【R8】______
The next generation of sensors to monitor bridge health will be even more sophisticated. For one thing, they will be wireless, which will make installing them a lot cheaper.【R9】______
Dr Lynch is the chief researcher on a project intended to help design the next generation of monitoring systems for bridges. He and his colleagues are also looking at how to make a cement-based sensing skin that can detect excessive strain in bridges. Individual sensors, says Dr Lynch, are not ideal because the initial cracks in a bridge may not occur at the point the sensor is placed.【R10】______He is also exploring a paint-like substance made of carbon nanotubes that can be painted onto bridges to detect corrosion and cracks. Since carbon nanotubes conduct electricity, sending a current through the paint would help engineers to detect structural weakness through changes in the paint’s electrical properties.
A. The new Minneapolis bridge joins a handful of "smart" bridges that have built-in sensors to monitor their health.
B. The kilometers of wire needed to connect sensors to central computers can add significantly to the system’s cost, according to Jerome Lynch of the University of Michigan, Ann Arbor.
C. By 2025 all bridges in American will have been equipped with this advanced technology.
D. A continuous skin would solve this problem.
E. In the wake of the catastrophe, there were calls to harness technology to avoid similar mishaps.
F. Engineers then installed additional weights as dampeners.
【R6】
选项
答案
E
解析
第二段提到了2008年的一场灾难,此处的答案应是起到承上启下作用的句子,选项E符合要求。
转载请注明原文地址:https://kaotiyun.com/show/O5FO777K
0
考博英语
相关试题推荐
Byfarthemostcommondifficultyinstudyissimplefailuretogetdowntoregularconcentratedwork.Thisdifficultyismuchg
Therearethreeseparatesourcesofhazard【C1】______totheuseofnuclearreactiontosupplyuswithenergy.Firstly,theradioa
He____thejobbecauseitinvolvedtoomuchtraveling.
AstheyturnedintoUpshotRisewherehisparentslived,JackletgoofRuth’shand.UpshotRisewasnotahand-holdingstreet.W
Seariseasaconsequenceofglobalwarmingwouldimmediatelythreatenthatlargefractionoftheglobelivingatsealevel.Nea
ThecollapseoftheEarth’smagneticfield-whichguardstheplanetandguidesmanyofitscreatures-appearstohavestartedabou
Clonaid,acompanyassociatedbyagroupthatbelievesextraterrestrialscreatedmankind,announcedFridaythatithadproduced
Clonaid,acompanyassociatedbyagroupthatbelievesextraterrestrialscreatedmankind,announcedFridaythatithadproduced
Everyoneitseemshasahealthproblem.AfterpouringbillionsintotheNationalHealthService,Britishpeoplemoanaboutdirty
Somepeopleviewedthefindingswithcaution,notingthatacause-and-effectrelationshipbetweenpassivesmokingandcancerrem
随机试题
Itseemsverydifficult______.
Eversincehumanslivedontheearth,theyhavemadeuseof【C1】______formsofcommunication.Generallythis【C2】______ofthoughts
属于婴儿期高热抽搐最常见病因的是
结核分枝杆菌分类包括()。
背景材料:某施工单位承建一高层办公楼工程。在进行地下室聚氨酯防水涂料施工中,缺乏防火知识的工人甲在休息期间吸烟,由于涂料挥发形成的易燃气体浓度很大,地下室突然起火,造成4人重伤,2人医治无效死亡。问题:简要分析造成这起事故的原因。
下列不属于基金销售机构职责规范的是()。
在其他条件不变的情况下,商业银行的超额准备金率越高,则货币乘数()。
市场细分是一种通过对()进行细分,达到存大异求小同的市场分类方法。
(2013上项管)编号1、2、3、4、5、6的6个城市的距离矩阵如表2所示,设推销员从1城出发,经过每个城市一次且仅一次,最后回到1城,选择适当的路线,推销员最短的行程是______公里。
SOILQUALITY1Soilisarenewableresource,butonlyonaverylongtimescale,asittakeshundredsorthousandsofyearsfo
最新回复
(
0
)