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
Compact Disks If someone says to you your music CDs don’ t really hold any music on them, and they only have numbers recorde
Compact Disks If someone says to you your music CDs don’ t really hold any music on them, and they only have numbers recorde
admin
2014-08-13
30
问题
Compact Disks
If someone says to you your music CDs don’ t really hold any music on them, and they only have numbers recorded on them, you may not believe it. In fact, he is right in that sound is actually recorded onto the CDs as special numbers—a digital code. The code is pressed onto the CD as bumps(隆起)on a long spiral track almost five kilometers long. These bumps are an average of 0.5 microns(微米)wide.
A small laser beam shines onto the bumps as the CD turns. The light is reflected back to a receiver that records how the laser light bounces back. This lets the CD player turn the reflected light back into the original code. This means you can hear the original code as music.
Digital codes are used with many technologies. E-mail needs these kinds of code numbers. Space probes(探测仪)communicate with their ground station on earth using digital codes. Bar codes are read as digital codes in computer systems. Digital communications with cell phones need digital codes. Weather radios also tune in to specific signals using these codes.
There are many types of compact disks. One format is called CD-RWs. They can be recorded on and re-recorded on(rewritten on)as you would do with a floppy disk(软盘). Another format is the CD-ROM. The technology for recording on these disks is different from other CDs. These CDs have a dye layer that the CD writer can darken or leave clear. The clear and dark spots are the digital code. CD-ROM stands for Compact Disc—Read Only Memory. This disk is like a "super" floppy disk that can hold lots of information. One CD-ROM can hold the same amount of data as 500 floppy disks. Information is permanently recorded onto it. Computer games and other programs are considered to be CD-ROMs.
CDs were first sold to the public in 1982. These CDs still play well and sound fine. Current CDs are expected to last between 70 to 200 years. Of course, you can make sure your CDs last a long time by taking care of them.
Science keeps on developing. It may not be many more years before a completely new technology is invented and introduced to the public for music recording. In the meantime, there is no doubt you will continue to enjoy listening to your favorite music on CDs and play your favorite computer games on CD-ROMs.
Music is recorded onto CDs as______.
选项
A、laser beams
B、digital codes
C、musical notes
D、special sounds
答案
B
解析
根据第一段第二句可知,声音是以特殊数字——数码的形式存储在光盘上的。
转载请注明原文地址:https://kaotiyun.com/show/uTQd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
Intherecentpast,medicalresearchershaveshownthatheartdiseaseisassociatedwithcertainfactorsinourday-to-daylives
Intherecentpast,medicalresearchershaveshownthatheartdiseaseisassociatedwithcertainfactorsinourday-to-daylives
1.Medicineisthescienceandartofhealing.Itisasciencebecauseitisbasedonknowledgegainedthroughcarefulstudyand
Lookingtohelptheenvironment?Considerthefollowingsimpleideas.Turnoffelectricaldeviceswhenthey’renotbeinguse
Americansstillhavebeengainingweight,althoughtheyhavecuttheiraveragefatintakefrom36to34percentoftheirtotald
Solvingaproblemcanbebrokendownintoseveralsteps.First,theproblemmustbeidentifiedcorrectly.Psychologistsreferto
CosmeticsurgeryismorepopularintheUSthananywhereelse.Noteveryoneisagoodcandidateforliposuction.
SaunaCeremonial(仪式性的)bathinghasexistedforthousandsofyearsandhasmanyforms,oneofwhichisthesauna.TheFinnsha
Somecommentsarejustinvitingtrouble.
IamfeelingalotmorehealthythanIwas.
随机试题
下列情况下,在法律没有特别规定,合同也没有特别约定时,一方当事人有权解除合同的情形是()
疟疾患者,热多寒少,汗出不畅,头痛,骨节酸痛,口渴引饮,便秘,溲赤,舌红苔黄,脉弦数。其治法是()
根据我国民事诉讼法的有关规定,收到通知的债权人应在收到通知后______内向法院申报债权,逾期末申报的,法律后果是______。()
某房地产开发商拟购置一写字楼用于出租经营,合同价为12000。元。开发商自有资金的投入额为6000万元,其余投资利用银行贷款,年贷款利率为6%。还款从获得租金收入的年度开始,15年内以每年等额偿还本息的方法偿付。开发商经过与其他的投资机会比较,确定该项投资
(2010年)将二进制小数0.1010101111转换成相应的八进制数,其正确结果是()。
20×4年2月,某市财政局派出检查组对某国有外贸企业20×3年度的会计工作进行检查,发现存在以下情况:(1)20×3年2月,该企业财务处处长安排其侄女(持有会计从业资格证书)在财务处任出纳,并负责保管会计档案。(2)发现一张发票“金额”
甲公司2016年1月1日实施股权激励计划并经股东大会批准,其主要内容为:甲公司向其控股的乙公司10名管理人员每人授予10000份现金股票增值权,行权条件为乙公司2年内净利润增长率达到8%;满足行权条件的,每份现金股票增值权可以从甲公司获得按股票市场价格计算
某日,季某在开货车运送小鸡苗途中,货车意外发生侧翻。季某被困驾驶室只能眼睁睁看着满地乱跑的小鸡苗无能为力,有几个村民用纸箱装小鸡苗私自带走,期间越来越多的人集聚发生哄抢。警方接到求救电话后赶到,警方采取下列应急措施中首要的是()。
It’sofficial:therearenowmorepoorpeopleinAmericathanatanyothertimeinthe52yearsrecordshavebeenkept.Weknew
JasonBraddockknewhehadtopayforhiscollegeeducation,sohewenttowork.Hisfirstjobwaswithhismotherandauntwhen
最新回复
(
0
)