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, 30,000 homes in on
Superconducting Ceramic (陶瓷) An underground revolution begins this winter. With the flip (轻击) of a switch, 30,000 homes in on
admin
2009-06-15
63
问题
Superconducting Ceramic (陶瓷)
An underground revolution begins this winter. With the flip (轻击) of a switch, 30,000 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. All 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/OXLd777K
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
MiddleAge:ALowPointforMostPeoplearoundtheglobehittheheightoftheirmiseryanddepressioninmiddle【51】______,
Strenuousexercisemayprotectagingbrain.
OneGoodReasontoLetSmallpoxLiveIt’snowafairbetthatwewillneverseethetotalextinctionofthesmallpoxvirus.
OntheTrialoftheHoneyBadgerOnarecentfieldtriptotheKalahariDesert,ateamofresearcherslearnalotmoreabout
DNAFingerprintingDNAisthegeneticmaterialfoundwithinthecellnucleiofalllivingthings.Inmammals(哺乳动物)thestrand
Hertreatmentofthesubjectisexhaustive.
Whichofthefollowingstatementsisnotmeantinthefirsttwoparagraphs?GovernorJebissuetheemergencyorderbecausehe
ATripEveryyearNewZealanderslivinginLondoncanbeseenloadingupKombivansandheadingofftoexperiencethe“cla
WideWorldofRobotsEngineerswhobuildandprogramrobotshavefascinatingjobs.Theseresearcherstinker(修补)withmachines
SharksPerformaServiceforEarth’sWatersItishardtogetpeopletothinkofsharksasanythingbutadeadlyenemy.They
随机试题
根据专利法律制度的规定,下列各项中,不授予专利权的有()。
(see)________fromthewindowoftheplane,thecitylookscleanerandmorebeautiful.
45岁女性,其左边第3肋间锁骨正中线处有一穿刺伤,血压80/70mmHg,心率100/min,SaO299%。左胸管已放置,并流出2000ml血液,请问接下来应如何处置
下列肿瘤中,属于恶性肿瘤的是
关于以划拨方式取得土地使用权的房地产转让时适用的《房地产管理法》特殊规定,下列哪些表述是正确的?(2009年卷一76题)
建设项目负责人的内部职责包括()。
()是指银监局根据法律、法规的规定,对银行机构进入市场、银行业务开展和银行从业人员素质实施管制的一种行为。
在编制现金预算时,计算某期现金余缺必须考虑的因素有()。
下列交易的会计处理中,不符合会计制度规定的是()。
Firecanhelppeopleinmanyways.Btuitcanalsobeveryharmful(有害的).Firecankeepyourhouse(41),givelightandcookfo
最新回复
(
0
)