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
Superconducting Ceramic (陶瓷) An underground revolution begins this winter. With the flip (轻击) of a switch, 30,00.0 homes in o
Superconducting Ceramic (陶瓷) An underground revolution begins this winter. With the flip (轻击) of a switch, 30,00.0 homes in o
admin
2009-06-15
73
问题
Superconducting Ceramic (陶瓷)
An underground revolution begins this winter. With the flip (轻击) of a switch, 30,00.0 homes in one part of Detroit will soon become the first in the country to receive electricity transmitted by ice-cold high-performance cables. Other American cities are expected to follow Detroit’s example in the years ahead, which could conserve enormous amounts of power.
The new electrical cables at the Frisbie power station in Detroit are revolutionary because they are made of superconductors. A superconductor is a material that transmits electricity with little or no resistance. Resistance is the degree to which a substance resists electric current. Ail common electrical conductors have a certain amount of electrical resistance. They convert at least some of the electrical energy passing through them into waste heat. Superconductors don’t. No one understands how superconductivity works. It just does.
Making superconductors isn’t easy. A superconducting material has to be cooled to an extremely low temperature to lose its resistance. The first superconductors, made more than 50 years ago, had to be cooled to-263 degrees Celsius before they lost their resistance. Newer superconducting materials lose their resistance at-143 degrees Celsius.
The superconductors cable installed at the Frisbie station is made of a ceramic material that contains copper, oxygen, bismuth (铋), strontium (锶), and calcium (钙). A ceramic is a hard, strong compound made from clay or minerals. The superconducting ceramic has been fashioned into a tape that is wrapped lengthwise around a long tube filled with liquid nitrogen. Liquid nitrogen is supercold and lowers the temperature of the ceramic tape to the point where it conveys electricity with zero resistance.
The United States loses an enormous amount of electricity each year to resistance. Because cooled superconductors have no resistance, they waste much less power. Other cities are watching the Frisbie experiment in the hope that they might switch to superconducting cable and conserve power, too.
选项
A、With a flip of switch, electricity can be transmitted.
B、Other American cities can benefit from the high-performance cables.
C、Great amounts of power can be conserved.
D、Detroit will first receive electricity transmitted by the new electrical cables.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/u1Ld777K
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
Broken:DreamsofRuralPeaceItwasduskinTubneyWoods,deepinruralOxfordshire.Thebirdsweresingingattheendofan
Broken:DreamsofRuralPeaceItwasduskinTubneyWoods,deepinruralOxfordshire.Thebirdsweresingingattheendofan
InitiallythewriterdidnotwanttobuyahearingaidbecauseManypeopleleavetheirhearingproblemuntreatedbecause
QuiteafewNewYorkerstooktheirmayor’srecentadviceandgotaflushot.Someotherillnessesmayexhibitsymptomssimilar
Accordingtothepassage,apersonsufferingfromcancerwillAccordingtotheNewYorkTimes’report,acombinationoftwonew
CampbellbelievespeopleshouldpaymoreattentiontohealthpromotionanddiseasepreventionbecausemostofthesediseasesWh
CementwasseldomusedinbuildingduringtheMiddleAges.
Thenewapartmenthadmanydrawbacks,mostnotablyitsprice.
PoolWatchSwimmerscandrowninbusyswimmingpoolswhenlifeguardsfailtonoticethattheyareintrouble.TheRoyalSoci
随机试题
有些教育者讲授思政课之所以效果不佳,一个重要的原因在于讲授的内容流于表面,_________,往往是从书本到书本,从理论到理论,致使授课看似在说理,实则缺乏理论深度与厚度,难以让人真正_________。依次填入画横线部分最恰当的一项是:
清营汤的功用是()
肥胖症患者最易引起哪一种并发症
男性,44岁,右胸车祸伤2小时,呼吸困难,发绀。查体:右前胸未见反常呼吸运动。胸部挤压试验阳性,右肺呼吸音降低。胸片显示右侧第8~10肋骨后端骨折。错误的处理是
合理的病室环境是
如果纳税人兼营不同税率的应税消费品,应当根据不同税率的消费品的()分别计算其应纳税额。
下列各项中,不属于“周转材料”科目核算的是()。
()的高等教育办学模式为“私立和公立系统,多重管理部门”。
社会主义精神文明对改革开放、现代化建设的保证作用表现为()。
—______,Mike.It’salittlechillyinhere.—Okay.IsthereanythingelseIcandoforyoubeforeIleave?
最新回复
(
0
)