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
39
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
Readthefollowingpassagecarefullyandthenparaphrasethenumberedandunderlinedparts.("Paraphrase"means"toexplainthem
Futuristshaveidentifiedtwochangesthatseemtobecentraltocontemporarysociallife.First,theU-nitedStatesisbeingre
Theenergycrisis,whichisbeingfeltaroundtheworld,hasdramatizedhowthecarelessuseoftheearth’sresourceshasbrough
Somepeopleholdtheviewthatastudent’ssuccessinuniversitystudyfollowsthepatternasthatoffarming,whichischaracte
"Governmentsthatwanttheirpeopletoprosperintheburgeoningworldeconomyshouldguaranteetwobasicrights:therighttopr
Thisisamarketinwhichenterprisingbusinesses_____forthedemandsofteenagersandolderyouthsinalltheirrockmaniaand
Heatexhaustionisaconditioncausedby____tosunlightoranotherheatsourcewhichoftenresultsindehydrationandsaltdeple
Thepoliceaccusedhimofsettingfiretothebuildingbuthedenied_____intheareaonthenightofthefire.
Itwasunfortunatethat,aftersotrouble-freeanarrival,heshouldstumbleinthedarkashewasrisingandseverelytwisthis
Mymother’sparentscamefromHungary,butmygrandfathercouldtracehisorigintoGermanyandalsohewaseducatedinGermany.
随机试题
王主任是某护理部主任,她把工作分配给总护士长等管理人员,对于例行性业务按照常规措施和标准执行,她加以必要的监督和指导,只有特殊情况时她来处理。她可集中精力研究及解决全局性管理问题,也调动了下级的工作积极性。这种工作方式遵循的组织原则是
驱铅治疗的首选药物是()
患者,女,27岁。上前牙咀嚼不适1个月余。口腔检查可见远中邻腭面深龋,穿髓,探诊(-),叩诊(±),牙髓活力电测验(-),牙周检查(-)。X线片示:根尖有边界不清楚的透影区,呈云雾状。该患者最佳治疗措施是
治疗原发性支气管肺癌阴虚毒热证,应首选的方剂是()
专利申请人依法提出的专利申请被专利局受理后,享有以下权利( )。
针对刘稳的起诉,人民法院应:如果开庭当天刘稳因没有坐上开往县城的早班车,未能出庭,对此,人民法院应当:
下列有关票据承兑的说法正确的是()。
下列各项中,应记入“预付账款"科目借方的是()。
甲方击球后,球触网又翻落在乙方台面的网架夹钳上,弹起后在乙方台面上空被乙一板将球击中甲方台面成“死球”。此时应判()。
Jackarrivedattherailwaystationat4o’clockintheafternoon.Itwas4o’clockintheafternoon______Jackarrivedatther
最新回复
(
0
)