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
29
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
Periodicallyinhistory,therecomeperiodsofgreattransitioninwhichworkchangesitsmeaning.Therewasatime,perhaps10,
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______istos
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Fordecades,postersdepictingrabbitswithinflamed,reddenedeyessymbolizedcampaignsagainstthetestingofcosmeticsonani
Fordecades,postersdepictingrabbitswithinflamed,reddenedeyessymbolizedcampaignsagainstthetestingofcosmeticsonani
YouwillhearaconversationbetweenMissGreen,aneducationaljournalist,andProfessorWilson,anexpertineducationalstudi
A=RotherhitheB=BarnesC=WillesdenD=King’sCrossWhichcity...usedtohavelotofproblemssuchasdrugs,streetc
WhendidKantbecomeaprofessor?
Periodicallyinhistory,therecomeperiodsofgreattransitioninwhichworkchangesitsmeaning.Therewasatime,perhaps10,
GoldwasdiscoveredinCalifornia______.
随机试题
世界文学史上第一部文人史诗是
头颅侧位片不能检查
下列不会引起肾病综合征的疾病是
最大鼻旁窦是
沙眼衣原体治疗首选()。
主要考察在指定时间内,对各种各样的文书问题的处理和反应能力,包括备忘录、信件、电报、电话记录等的评价中心形式是()。
关于经营杠杆系数,下列说法不正确的是()。
信用是一种特殊的价值运动形式,是以______和______为条件的单方面的______。
材料:济南市某中学为了预防学生早恋,制定了“关于严禁男女生非正常交往的处罚规定”,规定中要求,若学生出现“同乘一辆自行车或电瓶车非姐弟兄妹关系”“男女成双入对、经常一起出入超过两次”等7种情形时,学生将回家反省7天并签试读协议,若属再犯劝其退学。问题:结合
A、Ittastedbitter.B、Ittastedgood.C、Itwasstrange.D、Itwassweet.B短文提到那个人将糖浆与苏打水掺和后喝味道很好,故选B。浏览选项可推测本题应问某物的味道,听到有关味道时可适当做
最新回复
(
0
)