首页
登录
职称英语
[originaltext]Mr. Jones: What materials were used for road surfaces during the
[originaltext]Mr. Jones: What materials were used for road surfaces during the
游客
2023-12-08
10
管理
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、100 feet
B、78 feet
C、68 feet
D、88 feet
答案
B
解析
宾州高速公路每一个方向为12英尺,中间被10英尺的路面隔开,每—边又拓宽10英尺,这样总宽度为78英尺。
转载请注明原文地址:https://tihaiku.com/zcyy/3256567.html
相关试题推荐
[originaltext]Officer:Goodmorning.CanIhelpyou?Student:Yes.I’dliketo
[originaltext]Officer:Goodmorning.CanIhelpyou?Student:Yes.I’dliketo
[originaltext]Officer:Goodmorning.CanIhelpyou?Student:Yes.I’dliketo
[originaltext]Officer:Goodmorning.CanIhelpyou?Student:Yes.I’dliketo
Duringthe1970’sand1980’spoliticalextremismandterrorismfrequentlyfoc
Duringthe1970’sand1980’spoliticalextremismandterrorismfrequentlyfoc
[originaltext]TheUnitedStatescentralbankhascutitsmaininterestrate
[originaltext]Robinson:Li,IsuggestwedoaquicktourofcentralLondon.As
[originaltext]Robinson:Li,IsuggestwedoaquicktourofcentralLondon.As
[originaltext]Robinson:Li,IsuggestwedoaquicktourofcentralLondon.As
随机试题
Hewouldalwaysignorethefactof______suchacontradictioninhisinnerthough
MarieCuriewasthefirstfemaleprofessoratSevres,acollegeforgirlswh
热压法制备橡胶膏剂的常用填充剂是A.氧化锌 B.锌钡白 C.滑石粉 D.微
甲、乙、丙、丁四人欲成立一家有限责任公司,注册资本为100万元。他们各自所占份
银行信贷资金运用的去向主要有()。A.各项贷款 B.有价证券及投资 C.黄金
关于高压固结试验,下列哪些选项的说法是正确的?( )A、土的前期固结压力是土层
脊髓闰绍细胞对脊髓前角运动神经元的抑制称为()A.周围性抑制 B.传入侧支抑
办理实行网点审批的个人质押贷款时,在签约和发放流程中,执行质权设定,贷款发放和贷
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
下列费用项目中,应计入建筑安装工程人工单价的有( )。A.职工工会经费 B.物
最新回复
(
0
)