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
A、Gravel. B、Asphalt. C、Macadam. D、Concrete. DThe engineer回答是:Usually they were gravel and macadam.Tars and asphalt were original
A、Gravel. B、Asphalt. C、Macadam. D、Concrete. DThe engineer回答是:Usually they were gravel and macadam.Tars and asphalt were original
admin
2014-06-02
15
问题
Mr. Jones: What materials were used for road surfaces during the last century?
Engineer: Usually they were gravel and macadam. Tars and asphalt were originally used only as coverings, but later they were used as binders and finally as hot mixtures.
Mr. Jones: Concrete is a modern material as far as road - building goes, isn’t it?
Engineer: Relatively speaking. But you might be surprised to know that a concrete road was built as early as 1893 in Ohio. But it was only 5 miles long. More extensive projects were not undertaken until much later, around 1912 or 1913.
Mr. Jones: This was because of the increase in traffic?
Engineer: That’s right. Especially in the use of heavy tracks. More rigid pavements, such as concrete and brick, became a necessity. For light traffic, though, water-bound macadam, gravel, sand clay, and bituminous mixtures were still used.
Mr. Jones: What are turnpikes usually made of?
Engineer: Turnpikes are usually made of reinforced concrete about 8 to 10 inches thick, placed on a granular sub-base, which in turn is placed on a well - tacked earth subgrade. Of course, the construction depends a lot on the local climate, rainfall, soils, and so on.
Mr. Jones: How do you mean--climate?
Engineer: Frost is one of the main problems. For example, in Maine, where frost is quite frequent, the typical turnpike construction is a thin top layer of asphaltic concrete on a base layer of sand and gravel placed on a 36 - inch, frost - free, granular sub - grade.
Mr. Jones: What is the width of these roads?
Engineer: The early two - lane roads were about 20 feet wide. But with higher automobile speeds, the width requirements increased greatly. To give you an example, the Pennsylvania Turnpike has two 12 - foot lanes in each direction, separated by a median 10 feet wide. On each side there is a 10 - foot stabilized shoulder, marking a total width of 78 feet. The New Jersey Turnpike averages 100 feet in width, with three lanes in each direction.
Mr. Jones: I guess wider roads are being built every day.
Engrneer: That’s right. Sometimes you think that, no matter how good a road you build, the speed and weight of vehicles will always be one step ahead.
选项
A、Gravel.
B、Asphalt.
C、Macadam.
D、Concrete.
答案
D
解析
The engineer回答是:Usually they were gravel and macadam.Tars and asphalt were originally used only as coverings,but later they were used as binders and finally as hot mixtures.“gravel”为“a loose mixture of rock fragments or pebbles”砾石;“macadam”为“pavement made of layers of compacted broken stone; now usd,bound with tar or asphalt”碎石。
转载请注明原文地址:https://kaotiyun.com/show/CApO777K
0
专业英语八级
相关试题推荐
TheCommonwealthofNationshas______membercountriesnow.
Manyarticlesandbookshavebeenwritteninrecentyearsaboutcultureinorganizations,usuallyreferredtoas"CorporateCult
A、TheuniversitybroadcastsonbothBBCandITV.B、Theuniversityforpeoplewho’yeneverbeentouniversity.C、Theuniversity
A、investmentsB、theTVlicensesC、advertisementsD、thegovernmentC
From1980to1989,thepopulationbetweentheageof25and44increasedby21%because______.
B美国文学之作家概况。EmilyDickinson是19世纪美国著名的女诗人,是后现代主义的代表人物,和WaltWhitman齐名。代表作有I’mNobody.WhoAreYou?(《我是无名小卒,你是谁?》)。
HowtoConquerPublicSpeakingFear?I.IntroductionA.Publicspeaking—acommonsourceofstressforeveryoneB.Thetruthabo
HomerHomer:oneofthegreatest(1)______poets.famousfortwoepicpoems:relatedwith(2)______WarI.Illiad:A.describesth
由小学到中学,所修习的无非是一些普通的基本知识。就是大学四年,所授课业也还是相当粗浅的学识。世人常称大学为“最高学府”,这名称易滋误解,好像过此以上即无学问可言。大学的研究所才是初步研究学问的所在,在这里做学问也只能算是初涉藩篱,注重的是研究学问的方法与实
TheadvantageofassociatingthebirthofdemocracywiththeMayflowerCompactisthatitiseasytodoso.Thepublicbelieves
随机试题
文档标题导航有先决条件,打开的超长文档必须事先设置有________。
镜检可见花粉粒极面观呈三角形,有3副合沟,该药材是
颊肌的起点是
男,55岁,突发持续胸痛4小时。查体:BP110/50mmHg,心率30次/分,律齐,心电图示急性下壁、右室心肌梗死,三度房室传导阻滞。为提高心室率应立即采取的治疗措施是
在监理合同履行过程中,发生不可抗力导致施工被迫中断,不可抗力影响消失后恢复施工前必要的监理准备工作属于()工作。
根据《证券公司从事代办股份转让主办券商业务资格管理办法(试行)》的规定,最近2年不存在重大违法违规行为的证券公司才有资格申请从事代办股份转让服务业务。()
根据《企业破产法》规定,管理人的职权有()。(2015年)
《中共中央关于全面推进依法治国若干重大问题的决定》指出,全面推进依法治国,总目标是()。
海尔总裁张瑞敏曾经说过这样的话,企业要靠无形资产来盘活有形资产,只有先盘活人,才能盘活资产。对这句话,准确的理解是()。
A、Heneedsthemoneybadly.B、Heenjoysusingcomputers.C、Hewantstoworkinthecitycentre.D、Hehasrelevantworkingexperi
最新回复
(
0
)