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
120
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.
【R6】
选项
答案
E
解析
本题的答题关键是看懂第一段与第二段的内容。第一段讲旧桥的坍塌,第二段讲新桥的开通,以及新桥怎样才能避免发生同样的事故。
转载请注明原文地址:https://kaotiyun.com/show/OMUO777K
0
考博英语
相关试题推荐
【M1】______Applicationfilesarepiledhighlythismonthincollegesacrossthecountry.【M2】______Admissionsofficersareporing
【M1】______Applicationfilesarepiledhighlythismonthincollegesacrossthecountry.【M2】______Admissionsofficersareporing
【M1】______Applicationfilesarepiledhighlythismonthincollegesacrossthecountry.【M2】______Admissionsofficersareporing
Ourpresentgenerationofculturalcritics,arrivingaftertheassaultofpostmodernismandtheincreasinglywidespreadcommerci
GoremadeacalltoBushto______hisdefeatintheelection,buthesoonretracteditaswordspreadthattheballotshadberec
Accordingthereporttheailmentsoftheworld’spoorreceived______attentioncomparedtothediseasesoftherichinthepast
Hippiesweremembersofayouthmovementofthe1960’sand1970’sthatstartedintheUnitedStatesandspreadtoCanada,Great
Thelivelihoodofeachspeciesinthevastandintricateassemblageoflivingthingsdependsontheexistencesofotherorganism
Thelivelihoodofeachspeciesinthevastandintricateassemblageoflivingthingsdependsontheexistencesofotherorganism
随机试题
按锉纹密度分2号锉刀是指()锉刀。
真实压力比大气压高出的数值通常用下列哪一项表示?()
为确保临床检测过程和结果在偏差和精密度方面达到预定标准的质量工作称为
A.妊娠期腰腹坠痛,阴道少量下血,色淡黯,质稀,头晕耳鸣B.妊娠期阴道少量下血,色淡红,质稀,气短懒言C.妊娠期阴道少量下血,色深红,质稠,口渴饮冷D.妊娠期腰腹坠痛,伴阴道少量下血,色淡,质稀,精神倦怠E.妊娠期阴道少量下血,色淡黯,质稀,腰膝酸
蛋白质变性后的主要表现是
企业发行企业债券必须符合的条件是()。
证券交易当事人买卖的证券,( )。
在涉外税收中,由国家税务局负责征收的有()。
我国在世界各地开办孔子学院,向全世界人民介绍中国文化。这说明教育具有文化()。
下列属于我国国家机构的是
最新回复
(
0
)