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-half kilometer an hour slower than had b
A Canadian researcher has discovered that sound travels 【21】______ air more than one-half kilometer an hour slower than had b
admin
2010-07-06
46
问题
A Canadian researcher has discovered that sound travels 【21】______ air more than one-half 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 microph ones. 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 always has 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.
【36】
选项
A、for
B、unlike
C、so
D、as
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/HyDd777K
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
TheissueofonlineprivacyintheInternetagefoundnewurgencyfollowingtheSept.11terroristattacks,sparkingdebateover
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【C1】________toth
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【C1】________toth
Oneofthemostalarmingthingsaboutthecrisisintheglobalfinancialsystemisthatthewarningsignshavebeenouttherefo
Themainpurposeofthefirstparagraphis______.WhatdidthefuturelooklikeforBritain’sfoodproductionatthetimeofw
Theauthor’sprimarypurposeinthetextisto______.Itcanbeinferredfromthepassagethattheauthorwouldbemostlikely
Accordingtothepassage,thechiefpurposeofexplorersingoingtounknownplacesinthepastwas______.Atpresent,aproba
WhenDavisonwashidingbythestairs,thepolicemenwereAfterDavisongotintothebathroom,he
【B1】Thelegalquestionaboutwhetherandtowhatextentitisappropriatetoauditandmonitorcompanycomputersystemsisnoty
随机试题
AFerguson法BBassini法CMcVay法D疝成型术E保守疗法老年直疝
关于精冲分裂症单纯型,下列何种说法不正确
首次在中国销售的药品在进口通关时,对其进行检验的机构是()
保税物流中心存放保税物货物没有时间限制。
发展体能的原则是()。
了解学生是班主任工作的基础,研究学生是班主任工作的基本能力,班主任了解和研究学生的基本内容包括()。
以下是一则广告:为了确定该广告的可信性,以下相关问题必须询问清楚的是()。Ⅰ.去年共举办了多少期这类培训班,共有多少学员毕业?Ⅱ.去年有多少毕业班学员进行了就业咨询?Ⅲ.对于找到工作的学员,就业咨询究竟起到了多少作用?Ⅳ.咨询者找到的是
某饮料店有纯果汁(即浓度为100%)10千克,浓度为30%的浓缩还原果汁20千克。若取纯果汁、浓缩还原果汁各10千克倒入10千克纯净水中,再倒入10千克的浓缩还原果汁,则得到的果汁浓度为:
在考生文件夹下,存在一个数据库文件“sampl.accdb”。试按以下操作要求,完成表的建立和修改:将“tEmployee”表中的“职称”字段的“默认值”属性设置为“副教授”。
Althoughmanyhypotheseshavebeenproposedtoexplainwhysomeplantcommunitiesaremoresusceptiblethanotherstoinvasionb
最新回复
(
0
)