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
In an average winter, highway departments spread some ten million tons of salt to keep roads safe. The corrosive effects are wel
In an average winter, highway departments spread some ten million tons of salt to keep roads safe. The corrosive effects are wel
admin
2009-06-15
101
问题
In an average winter, highway departments spread some ten million tons of salt to keep roads safe. The corrosive effects are well known, but for years they’ re been dismissed with the argument that at around $ 25 a ton, salt is far cheaper than any alternative.
Lately, economists have added up the actual costs. The Environmental Protection Agency estimates that salt-induced road damage and vehicle corrosion cost $ 3 billion a year. That does not include damage to underground cables, which adds hundreds of millions to utility bills. Nor does it reflect the cost of brine leaking into porous water pipes, threatening the water supply. Salty water leaches into roadbeds, kills evergreens and poisons streams.
The various costs probably add another $ 2 billion to the national salt bill. Scientists estimate the full economic, or "life cycle," cost for a ton of salt at $ 500, or 20 times the $ 25 purchase price. That begins to make the switch to calcium magnesium acetate, perhaps the most promising alternative look practical. CMA, made from acetic acid and dolomitic(含白石的) lime, costs $ 600 a ton and has minimal adverse effect. Some researchers believe the cost can be halved by making CMA from waste cheese whey or pulp-mill effluent.
While CMA and other alternatives are being researched, many cities and states are cutting back on their use of salt. Keeping dispensing equipment in good repair helps reduce the amount spread.
选项
A、road damage
B、vehicle corrosion
C、damage of underground cables
D、car accident
答案
D
解析
第一段第一句即点明冬天在路上撒盐是为了防止发生车祸。但盐可产生许多副作用,例如腐蚀街道和车辆,毁坏地下管道,威胁水供给等,这些也就是前三项的内容,所以选D。
转载请注明原文地址:https://kaotiyun.com/show/xQLd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
WelearnfromthefirstparagraphthatlaughterThewriter’sattitudetowardslaughteris
StemCellTherapyMayHelpRepairtheHeartAccordingtoscientistsintheUSA,stemcelltherapymayonedaybeabletorepa
DebateovertheUseofRenewableEnergyAmusableofRockefellerUniversityinNewYork,USsaysthekeyrenewable(可再生的)ene
RealityandPerceptionofPersonality1.Exceptyourbelovedwhosefaceyoumighthavelookedatmanytimesveryclosely,looka
PreservingNatureforFutureDemandsforstrongerprotectionforwildlifeinBritainsometimeshidethefactthatsimilarne
MoreAboutAlzheimer’sDiseaseScientistshavedevelopedskinteststhatmaybeusedinthefuturetoidentifypeoplewith
Whatareresearchersinterestedindoingastheroadaccidentsworldwideincreasetoashockingrate?Whichofthesafetydeve
SilencePleaseIfthereisonegroupofworkersacrosstheWesternworldwhowillbegladthatChristmasisover,thatgroup
Tenyearsaftertheevent,herdeathstillremainsa(puzzle).
Itisestimatedthatthereare______peoplesufferingfromobesityintheworld.WhichofthefollowingisNOToftenaccompani
随机试题
有以下公式:若已经正确引用math.h文件,下列不能正确计算上述公式的程序段是【】
作为一门独立学科的艺术学诞生于______。()
丹参可应用于()
病人,女,75岁,高血压病30余年,平日血压控制在140/90mmHg,糖尿病4年,应用降糖药物控制血糖。近半年来常于劳累时感心前区闷痛,持续1~2分钟,休息后缓解,未予诊治。4小时前突感胃疼伴烧心感,伴大汗,恶心呕吐1次,呕吐物为胃内容物。急诊入院。查:
甲房地产咨询公司(以下简称甲公司)设立于1998年,购买了位于某居住区配套的商业用房作为经营用房,注册资本为200万元。甲公司根据相关法律按税后利润的10%提取法定公积金,至2008年年底累积提取100万元,2009年甲公司税后利润为120万元,当年分配7
量子数n=4,l=2,m=0的原子轨道数目是:
“会计电算化”一词始于()。
某外商投资企业2005年度发生如下经济事项:(1)2005年4月,签订销售合同一份,金额50万元。(2)2005年11月,审查后发现记载资金的账户比期初多出100万元,其中包括应拨付给外地分支机构的资金30万元。(3)2005年12月,按规定到有关部
《物业管理条例》对前期物业管理招投标作了例外的规定。对于投标人少于()个的,可以采用协议的方式选聘物业管理企业。
A、10:30pm.B、11:00pm.C、11:30pm.D、12:00pm.D男士说,餐馆周末的营业时间一直到午夜,即12:00pm,故答案是D。关键是分辨weekdays和weekend的不同营业时间,做笔记时要迅速和完整地记下细节
最新回复
(
0
)