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、Maglev would get many cars off roads in future. B、Maglev would become only means of transportation. C、Maglev would turn into a
A、Maglev would get many cars off roads in future. B、Maglev would become only means of transportation. C、Maglev would turn into a
admin
2013-06-03
102
问题
What does maglev look like? Japanese engineers designed a vehicle that runs in a cradle-like track or guideway. Magnetic attraction and repulsion pull and push maglev forward. To stop the trains, the magnetic force is reversed, much like airplanes are stopped by reversing the force of the engines. Both types of maglev are quiet, fast, and save. Since maglev rides on air, there is no friction between wheels and rails to make noise or to slow it down. If the external power fails, there is a battery-operated system on the train itself that takes over and brings the cars to a smooth stop.
Maglev could be the answer to our problems. It could become the typical short and middle-distance mass transportation system of the twenty-first century. If it does, we will enjoy many benefits. We will ride in save, fast, quiet trains between cities up to about 500 miles apart in less time than it takes to fly if you include the time for ground transportation. We will conserve precious land because maglev can be built where railroads run, down the middle of existing super-highways or elevated above existing streets and roads. And we will probably save money, too. According to a German estimate, a mile of two-way track will cost about nine million dollars whereas a mile of interstate highway costs about 25 million dollars in the United States.
选项
A、Maglev would get many cars off roads in future.
B、Maglev would become only means of transportation.
C、Maglev would turn into a flying train.
D、Maglev would replace trans and planes.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/vvg7777K
0
大学英语四级
相关试题推荐
____________(据估计)overonehundredthousandpeoplehaveleftthepeninsula.
BeforeJackandMaryfinallydecidedtogetmarried,theyhadalongdiscussionabout________________(婚姻将可能怎样影响他们将来的事业).
Whydoestheauthormentionthediscoveryofairpressure?Fromthepassageweknowthat______.
A、Becauseapolice-carfollowedhis.B、Becausehewantedthemaninhiscararrested.C、Becauseitgrewdarkeranddarker.D、Bec
AIDSAcquiredImmunodeficiencySyndrome(AIDS),isakindofhumanviraldisease(病毒病)thatdamagestheimmunesystem,weake
Merchantandpassengershipsaregenerallyrequiredtohavealifepreserverforeverypersonaboardand,inmanycases,acerta
Whentimeswerehard,whitementhoughtthatChineseAmericanswereresponsibleforthewhitemen’sunemployment.Havinglived
Accordingtosociologists,thereareseveraldifferentwaysinwhichapersonmaybecomerecognizedastheleaderofasocialgr
A、Itisgoodforthechild.B、Themansaysheshould.C、Thelawrequiresit.D、Hismotherwantshimto.C
随机试题
下列各句中,加下划线的成语使用恰当的一句是()
A.冷冻干燥B.喷雾干燥C.减压干燥D.红外干燥E.沸腾干燥
李某与乙公司签订合同时,其行为性质应如何认定?()。某乙公司与甲公司所作的糖蜜交易属于何种类型的合同?()。
建筑业统计的调查单位是建设行政管理部门组建机构。()
根据《低合金高强度结构钢》(GB/T1591—2018)的分类,下列各组均属于普通质量低合金常用牌号的是()。
根据下列资料。回答以下问题。2016年年末,城镇就业人员41428万人,比2012年年末增加4326万人,年均增加1082万人,占全国就业人员的比重为53.4%,比2012年年末提高了5个百分点。随着户籍制度改革不断深化,居住证制度全面推行,农业
下列属于我国:1980年正式设置的经济特区是()。
n阶实对称矩阵A正定的充分必要条件是()
树中度为零的结点称为______。
A、 B、 C、 D、 C应该确定图中有几位男士正在划桨。
最新回复
(
0
)