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
51
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.
【37】
选项
A、another
B、any
C、other
D、others
答案
C
解析
本句意为“标准空气要保持相同含量的氮气、氧气、二氧化碳和其他气体。”故应选C。
转载请注明原文地址:https://kaotiyun.com/show/4DJd777K
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
Whydopeoplealwaysspendmoremoneythanplannedinsupermarkets?
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______istos
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______istos
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Fordecades,postersdepictingrabbitswithinflamed,reddenedeyessymbolizedcampaignsagainstthetestingofcosmeticsonani
YouwillhearaconversationbetweenMissGreen,aneducationaljournalist,andProfessorWilson,anexpertineducationalstudi
A=RotherhitheB=BarnesC=WillesdenD=King’sCrossWhichcity...usedtohavelotofproblemssuchasdrugs,streetc
随机试题
中国共产党政治建设的首要任务是()
开证行、保兑行或代其行事的指定银行,应有各自的合理时间来审核单据,以决定接受或拒绝接受单据,并相应地通知寄送单据的一方。该合理时间的期限不超过自收到单据之日起_______。
自然人之间因婚姻、血缘和法律拟制而产生的身份关系是()。
软X线摄影主要是利用X射线的
()是指国际债权人在进行国际资金融通时往往要求当地信誉好的银行、非银行金融机构、企业或政府为其提供担保。
结合实例分析影响迁移的主要因素。
唐蕃会盟碑
Excitement,fatigue,andanxietycanallbedetectedfromsomeone’sblinks,accordingtopsychologistJohnStern【1】WashingtonUn
“题”字的声旁是_____。
______doesnotbelongto"LakePoets".
最新回复
(
0
)