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
2019-06-10
35
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 America 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.
【R8】
选项
答案
F
解析
本题的关键是理解前一句的句意:这些感应器早已经探测到了一些支撑该桥的线缆中存在异常的震动。由此,发现问题之后就是对问题的解决。另外,选项F中的过去式应该引起同学们的注意。
转载请注明原文地址:https://jikaoti.com/ti/01NYFFFM
0
考博英语
相关试题推荐
【M1】______Applicationfilesarepiledhighlythismonthincollegesacrossthecountry.【M2】______Admissionsofficersareporing
【M1】______Applicationfilesarepiledhighlythismonthincollegesacrossthecountry.【M2】______Admissionsofficersareporing
【M1】______Applicationfilesarepiledhighlythismonthincollegesacrossthecountry.【M2】______Admissionsofficersareporing
Duringthenineteenyearsofthiscareer,FranceBattiatehaswonthe______ofawideaudienceoutsideItaly.
Ourpresentgenerationofculturalcritics,arrivingaftertheassaultofpostmodernismandtheincreasinglywidespreadcommerci
Ourpresentgenerationofculturalcritics,arrivingaftertheassaultofpostmodernismandtheincreasinglywidespreadcommerci
Animportantvariableaffectingcommunicationacrossculturesisfateandpersonalresponsibility.【T4】Thisreferstothedegree
Writeanessay(200-300words),accordingtothetopicgiven.Asameasuretocurbexcessivepopulationgrowth,theone-child
随机试题
治疗咳嗽痰稠,鼻咽干燥,属燥热伤肺者,宜选用( )
下列不参与本体感觉传导的是
男性,40岁,胸痛、反酸、烧心、嗳气2个月,胃镜检查食管黏膜未见明显异常,最有助于明确诊断的检查是
在下列质量事故中,发生()时,省级交通运输主管部门应在接报2小时内进一步核实,并按规定上报。
某基金从业人员因未按规定完成年检而被暂停从业资格,该从业人员违反了下列哪一原则?()
甲公司为居民企业,2016年发生下列业务取得的收入中,应当计入甲公司当年企业所得税应纳税所得额的有()。
()是老舍创作的剧本。[2013年真题]
Inaquietcourtroomtuckedawayinafederalbuildinghere,atitanicbattleiscompetingfreespeechagainstgovernmenteffort
Dr.MartinLutherKing,Jr.’scivilrightsmovementwasthefirststeptowardsatrulydesegregated(废除种族隔离的)Americaforblacks
Wefindthatbrightchildrenarerarelyheldbackbymixed-abilityteaching.Onthecontrary,boththeirknowledgeandexperienc
最新回复
(
0
)