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
25
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
______referstothesamenessorclosesimilarityofmeaning.
Australiawasoriginallyonecolonyof______.
TheRomansbrought______toEnglandaftertheyinvadedtheBritishIsles.
ThegeneralelectioninBritainisheldevery______years.
TheMississippiRiver,whichissometimescalled______,hasplayedavitalroleinthehistoryoftheUnitedStates.
Inthelate1960smanypeopleinNorthAmericaturnedtheirattentiontoenvironmentalproblems,andnewsteel-and-glassskyscra
Asregardsofsocialconventions,wemustsayawordaboutthewell-1.______knownEnglishclasssystem.Thisisanembarrassin
OurplanetEarthis4,600millionyearsold.Ifwereduce【M1】______thisinconceivabletime-spanintoanunderstandablecon
InternetPrivacyWiththerapiddevelopmentofe-commerce,companiesarenowcapableofcultivatingmore(1)______relationsh
Itissuggestedthatuniversitiesshouldrequireeverystudenttotakeavarietyofcoursesoutsidethestudent’smajorfieldof
随机试题
下列各项不符合循环经济减量化要求的是()
高血压病患者提示出现早期左心功能不全的体征是
A.造影剂总量80~100ml,流速3~4ml/s,扫描延迟时间15~20sB.造影剂总量60~100ml,流速2~2.5ml/s,扫描延迟时间30~35sC.造影剂总量60~100ml,流速2.5~3ml/s,扫描延迟时间20~25sD.造影剂总量
瓦氏位(Water’s)摄影,听眦线与胶片的角度关系是
以下均属于含有B族维生素的辅酶,除外
背景资料:某高级住宅工程,建筑面积80000m2,由3栋塔楼构成,地下2层(含车库),地上28层,底板厚度800mm,由A施工总承包单位承建。合同约定工程最终达到绿色建筑评价二星级。工程开始施工正值冬季,A施工单位项目部编制了冬期施工专项方
20×1年度,甲公司发生的相关交易或事项如下:(1)4月1日,甲公司收到先征后返的增值税600万元。(2)6月30日,甲公司以8000万元的拍卖价格取得一栋已达到预定可使用状态的房屋,该房屋的预计使用年限为50年。当地政府为鼓励甲公司在当地投资,于同日
下列属于著作权客体的有()。
妇女社会工作主要是以妇女为服务对象的社会工作,其工作内容涉及面很广。以下针对全体女性人口的妇女社会工作有()。[2009年真题]
Whatdoesthewomanthinkaboutthebusinessoftheman?
最新回复
(
0
)