首页
登录
职称英语
[originaltext] A computer is a machine designed to perform work mathematical
[originaltext] A computer is a machine designed to perform work mathematical
游客
2023-07-16
57
管理
问题
A computer is a machine designed to perform work mathematically and to store and select information that has been fed into it. It is run by either mechanical or electronic means. These machines can do a great deal of complicated work in a very short time. A large computer, for example, can add or subtract nine thousand times a second, multiply a thousand times a second, or divide five hundred times a second. Its percentage of error is about one in a billion digits. It has been estimated that human beings making calculations average about one mistake per two hundred digits.
The heart of an electronic computer lies in its vacuum tubes, or transistors. Its electronic circuits work a thousand times faster than the nerve cells in the human brain. A problem that might take a human being two years to solve can be solved by a computer in one minute, but in order to work properly, a computer must be given instructions--it must be programmed.
Computers can be designed for many specialized purposes--they can be used to prepare payrolls, guide airplane flights, direct traffic, even to play chess. Computers play an essential role in modern automation in many plants and factories throughout the world.
选项
A、It is the nerve cells of a computer.
B、It is the brain of a computer.
C、It is the eye of a computer.
D、It is the heart of a computer.
答案
D
解析
转载请注明原文地址:http://tihaiku.com/zcyy/2842336.html
相关试题推荐
[originaltext]Life-styleisthewayapersonlives;itincludeswork,leisu
[originaltext]Life-styleisthewayapersonlives;itincludeswork,leisu
[originaltext]Life-styleisthewayapersonlives;itincludeswork,leisu
[originaltext]M:WelcometoABCElectronics.First,letmegooverwhatwedoi
[originaltext]M:Hi,Helen.Howdidyourdrivingtestgo?Didyougetyourdriv
[originaltext]Whileradiobroadcastingwasstillinitsearlystagethewon
[originaltext]Whileradiobroadcastingwasstillinitsearlystagethewon
[originaltext]Everywhere,wateruseisincreasing.Humansalreadyuse54pe
[originaltext]Everywhere,wateruseisincreasing.Humansalreadyuse54pe
[originaltext]Winterweatherhasarrivedinnorthernareasoftheworld.Inmuc
随机试题
Therewasanoisy_____atthebackofthehallwhenthespeakerbeganhisaddress
[originaltext]M:Goodmorning,Ms.Smith.Welcometotoday’sshow.W:Thankyo
溶菌酶在催化反应时,下列因素中除哪个外,均与酶的高效率有关?( )A.底物形变
“物联网”是指通过装置在物体上的各种信息传感设备,如RFID装置、红外感应器、全
经济法律关系的主体中,可以签订建设工程合同的,一般只能是( )。A.公民 B
对个人、家庭和社区健康档案中的各种文字资料进行记录、查询和检索的计算机信息化管理
商业银行的监督系统由股东大会选举产生的()组成。A.监事会 B.稽核部 C
大部分计算机病毒都设定了发作条件.比如“欢乐时光”病毒的发作条件是“月+日=13
第四方物流的特点包括( )。 A.提供一整套完善的供应链解决方案 B
属性数据输入计算机的方法和非GIS的信息系统没有差异,一般是( )。A.扫描输
最新回复
(
0
)