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。Roads,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。Roads,streets, lanes are not heavy surfaces.只有turnpikes are extensive surfac
admin
2014-06-02
75
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、Roads.
B、Streets.
C、Lanes.
D、Highways.
答案
D
解析
这个题可以用排除法。Roads,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/DApO777K
0
专业英语八级
相关试题推荐
WhichofthefollowingstatementsisCORRECT?
LyricsandCriticalLiteracyIhaveorganizedmyexamplesintothefollowingsixtopics:TheEnvironment:TracyChap
Manyarticlesandbookshavebeenwritteninrecentyearsaboutcultureinorganizations,usuallyreferredtoas"CorporateCult
Allhisnovelsrevealthat,astimewenton,MarkTwainbecameincreasingly
A、Studying.B、Preparingsnacks.C、Playingcards.D、Learninghowtoplaybridge.C对话中男生问女生“Whereareyouheadednext?”(过一会儿你去哪儿?)
______proposedtheideaofthesurfacestructureandthedeepstructure.
Chemistryisthestudyofthebehaviorandcompositionofmatter.Allfoodsaremadeupofchemicalsubstancewhichundergoes
我直到几十年以后,才体会到云彩更多,霞光才愈美丽。从云翳中外露的霞光,才是璀璨多彩的。生命中不是只有快乐,也不是只有痛苦,快乐和痛苦是相生相成,互相衬托的。快乐是一抹微云,痛苦是压城的乌云,这不同的云彩,在你生命的天边重叠着,在“夕阳无
Amajoraspectofmanyfirms’marketingstrategiesoverthepastdecadehavebeenthedevelopmentofnewproducts.【M1】______Co
不消说,相识的人数是随了年龄增加的,一个人年龄越大,走过的地方、当过的职务越多,相识的人理该越增加了。可是,相识的人并不就是朋友。我们和许多人认识,或是因了事务关系,或是因了偶然的机缘棗如在别人请客的时候同席吃过饭之类。见面时点头或握手,有事时走访或通信,
随机试题
一夹一顶装夹,适用于工序较多、精度较高的工件。()
不需要洗手的情况是
A.《中国药房杂志》B.《中国药学文摘》C.《中药大辞典》D.《现代药物治疗学——临床药理与病理生理学基础》E.《药名词典》属于药品集的是
对于江心洲进行简化,若评价等级为二级,江心洲位于充分混合段,可以按()。
国际收支平衡表中列为贷方的项目有()。
单位要举办一次“珍惜生命,预防火灾”的宣传活动.你会怎样组织?
毛泽东思想
无符号二进制数11001000所表示的十进制数为(21)。
下面关于微处理器的叙述中,不正确的是______。
WhichofthefollowingaboutGagaisINCORRECT?
最新回复
(
0
)