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 Canadian researcher has discovered that sound travels 【21】______ air more than one-haft kilometer an hour slower than had been
A Canadian researcher has discovered that sound travels 【21】______ air more than one-haft kilometer an hour slower than had been
admin
2010-06-30
48
问题
A Canadian researcher has discovered that sound travels 【21】______ air more than one-haft kilometer an hour slower than had been believed. The discovery has surprised many engineers and scientists who learned they had been 【22】______ the wrong speed of sound for many years.
The speed of sound in air had been 【23】______ to be three-hundred-thirty-one-point-two-nine meters a second. But Doctor George Wong found, 【24】______ accident, that the speed of sound is only three-hundred-thirty-one-point-one-three meters a second. That is a difference of about sixteen centimeters a second.
Doctor Wong is a member of the National Research Council of Canada. He was studying ways to 【25】______ exactly the sound created by microphones. One of his experiments 【26】______ a number he could use to find the speed of sound. He was 【27】______ to learn that the speed of sound was slower than scientists had thought.
To explain the difference, Doctor Wong spent eighteen months 【28】______ past test research on the speed of sound. He finally found the 【29】______ of the difference. It was a mathematics mistake 【30】______ in Nineteen-Forty-Two by physicist H-C Hardy.
Doctor Wong’s 【31】______ does not mean a big change for the science of sound. This is 【32】______ Doctor Hardy and Doctor Wong measured the speed of sound for what is called " standard air".
Standard air exists only 【33】______ thought. It is a way for scientists to agree 【34】______ the same speed of sound. 【35】______ the air around us, standard air always has a temperature of zero degrees Celsius and the same atmospheric pressure 【36】______ the air at sea level. Standard air al ways have same amounts of nitrogen, oxygen, carbon dioxide and 【37】______ gases. And in standard air, the speed of sound does not change.
The change in the new speed of sound is 【38】______ small to affect the work of most sound scientists and engineers. But scientists say Doctor Wong’s discovery may 【39】______ improve instruments 【40】______ use the speed of sound to measure very short distances.
【33】
选项
A、on
B、among
C、in
D、with
答案
C
解析
in thought意为“在思想中,在想象中”。
转载请注明原文地址:https://kaotiyun.com/show/ODJd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Periodicallyinhistory,therecomeperiodsofgreattransitioninwhichworkchangesitsmeaning.Therewasatime,perhaps10,
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______istos
Whenaconsumerfindsthathispurchasehasafaultinit,whatisthefirstthingheshoulddo?
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
FewwritersareasreveredasJaneAusten.AccordingtoapollinMarch,PrideandPrejudice—aromancewithoutasinglekiss—is
YouwillhearaconversationbetweenMissGreen,aneducationaljournalist,andProfessorWilson,anexpertineducationalstudi
A=RotherhitheB=BarnesC=WillesdenD=King’sCrossWhichcity...usedtohavelotofproblemssuchasdrugs,streetc
A=RotherhitheB=BarnesC=WillesdenD=King’sCrossWhichcity...usedtohavelotofproblemssuchasdrugs,streetc
Periodicallyinhistory,therecomeperiodsofgreattransitioninwhichworkchangesitsmeaning.Therewasatime,perhaps10,
Themanbehindthisnotion,JackMaple,isadandywhoaffectsdarkglasses,homburgs(翘边帽)andtwo-toeshoes;yethehasbecomes
随机试题
小王以9800元的价格购买了1张91天期的面额为10000元的国库券,那么,当持有该国库券至到期日时,小王获得的年收益率是多少?
2007年7月1日就任中华人民共和国香港特别行政区第三届政府行政长官的是( )
风湿性心脏病二尖瓣狭窄致肺淤血,是由于
慢性前列腺炎指诊前列腺的特点是
下列药物用法错误的是
按照现行税法规定,税收征收管理机关可包括地方政府财政机关。()(2003年)
汉语的八大方言包括()。
贯彻启发性原则应遵循()基本要求。
考生文件夹下存在一个数据库文件“samp2,accdb”,里面已经设计好“tStud”、“tCourse”和“tScore”三个关联表对象及一个临时表对象“tTmp”。试按以下要求完成设计:创建一个查询,查找并显示选课学生的“姓名”和“课程名”两个字段
He’swatchingTV?He’s_____tobecleaninghisroom.
最新回复
(
0
)