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、Roads. B、Streets. C、Lanes. D、Highways. D这个题可以用排除法。Boads,streets, lanes are not heavy surfaces.只有turnpikes are extensive surfac
A、Roads. B、Streets. C、Lanes. D、Highways. D这个题可以用排除法。Boads,streets, lanes are not heavy surfaces.只有turnpikes are extensive surfac
admin
2014-04-28
45
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 modem 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, round 1912 or 1913.
Mr. Jones: This was because of the increase in traffic?
Engineer: That’s fight. 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 subgrade.
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 ex-ample, 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.
Engineer: 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、Roads.
B、Streets.
C、Lanes.
D、Highways.
答案
D
解析
这个题可以用排除法。Boads,streets, lanes are not heavy surfaces.只有turnpikes are extensive surfaces.高速公路。
转载请注明原文地址:https://kaotiyun.com/show/bRpO777K
0
专业英语八级
相关试题推荐
WhichofthefollowingisaBritishwriter?
AdvertisementsAnintelligentpersonwillnotallowhimselftobeinfluencedbyadvertisements.Instead,hewilltrytoget
AdvertisementsAnintelligentpersonwillnotallowhimselftobeinfluencedbyadvertisements.Instead,hewilltrytoget
TheHistoryofAmericanIndiansWhenEuropeansdiscoveredtheWesternhemisphere,theydiscoveredaraceofpeople.【1】____call
Afunnythinghappenedonthewaytothecommunicationsrevolution:westoppedtalkingtooneanother.Iwaswalkinginthepa
SiliconValleyisamagnettowhichnumeroustalentedengineers,scientistsandentrepreneursfromoverseasflockinsearchoff
SharedReadingandChildren’sOralLanguageFormanychildren,theprocessoflearningtoreadstartsbeforeschool.Theyen
燕子去了,有再来的时候;杨柳枯了,有再青的时候;桃花谢了,有再开的时候。但是,聪明的,你告诉我,我们的日子为什么一去不复返呢?——是有人偷了他们罢:那是谁?又藏在何处呢?是他们自己逃走了罢:现在又到了哪里呢?我不知道他们给了我多少日子;但我的手确
TheWorldBank’sRealProblemTheWorldBankisundeniablyincrisis.Butnotbecauseitspresident,PaulWolfowitz,gothis
A、thedecisionscanbetakenmoreeasily.B、EU’srelationshiptothememberstatesisdearlyregulatedC、thevotingproceduresi
随机试题
地层中()含量的多少能够间接地反映地层中有机物质含量的多少。
A.由致病力强的化脓菌引起B.由致病力弱的草绿色链球菌引起C.与A组溶血性链球菌感染有关D.与系统性红斑狼疮有关E.与慢性消耗性疾病有关风湿性心内膜炎的发生
腹膜后纤维瘤的超声表现有
A、丝圈保持器B、远中导板式间隙保持器C、下颌舌弓保持器D、Nance弓保持器E、活动功能保持器第一乳磨牙早失,第一恒磨牙未萌选择保持器是
【2014.北京】分别从各门学科中选择部分内容组成各种不同学科,彼此分立地安排其顺序、学习的课程是()。
把一根长为6米,宽2.4米,厚1米的木料锯成体积相等的两个长方体,它的表面积最多增加m平方米,最少增加n平方米,则m和n的值分别为
1998年,党在农村中推行土地承包制度30年不变主要是为了保证农民获取_______,从而促进农民投资农业的积极性。
Youaregoingtoreadalistofheadingsandatextabouthappiness.Choosethemostsuitableheadingfromthelistforeachnum
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubtitlefromthelistA-Gforeachnumberedpara
A、 B、 C、 D、 B(A)应该用similar(相似)来形容,还没有到达相同(same)的程度。(B)图片中男子的状态就是在靠着墙站着。还要记住,如果是靠在什么东西旁边的状态用leanagai
最新回复
(
0
)