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
专升本
A computer is a machine designed to perform work mathematically and to store and select information that has been fed into it. I
A computer is a machine designed to perform work mathematically and to store and select information that has been fed into it. I
admin
2015-10-30
45
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 play chess. Computers play an essential role in modern automation in many plants and factories throughout the world.
The selection calls the vacuum tubes the electronic computer’ s______.
选项
A、nerve cells
B、brain
C、nervous system
D、heart
答案
D
解析
文章第二段第一句说到“The heart ofan electronic computer lies in its vacuum tubes”,故选D。
转载请注明原文地址:https://kaotiyun.com/show/dNYC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
ManypeoplebelievethatAmericanslovetheircarsalmostmorethananythingelse.Theyare【21】aboutcars.Notonlyisthecart
Weareinterestedintheweatherbecauseit【21】ussodirectly—whatwewear,【22】wedo,andevenhowwefeel.Geographers,however
Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsoundslikethosemadebyanimals.Perhapshegruntedlik
Dancy:Hello,Fred.What’swrongwithyourarm?Fred:IbrokeitwhenIwasskatingduringtheholiday.Dancy:Oh,No!______Fred:
Itwas______thatWedecidedtostayindoors.
TheVoiceofAmericabeganduringtheWorldWarIIwhenGermanywasbroadcastingaradioprogramtogetinternational【21】.Ameri
ItisoftendifficultforvisitorstounderstandAmericans’lackofdesireforprivacy.Theyarenotanationofwalledgardens
ItwasnotuntilIjoinedanAmericanuniversitythatIrealizedthefactthattheAmericanandLebanesesystemsofcollegeeduc
Manypeoplearewonderingifitissafetotalkonthephonewhiledriving.Therehavebeenquiteafewaccidentswhiledrivers
Asoneapproachessomecrossroads,onecomestoasignwhichsaysthatdrivershavetostopwhentheycometothemainroadahea
随机试题
信息高速公路传送的是()。
甲国元首、乙国首脑、丙国外交部副部长参加一多边贸易条约的谈判。甲国对某条款提出了保留,乙国接受了甲国的保留。条约生效后,甲国又撤回了其保留。依《维也纳条约法公约》及国际法相关规则,下列说法正确的是哪些?()
在二手房经纪活动中,房地产经纪人需要利用()的信息,通过分析其偏好,才能找到与之匹配的房源,增大交易成功的概率。
轴是机器中的重要零件之一,用于支持旋转的机械零件和传递()。
《论语》中“学而时习之”体现的教学原则是()。
设g(x)在x=0处二阶可导,且g(0)=g’(0)=0,设则f(x)在x=0处()
DES加密算法采用的密码技术是(1),它采用(2)位密钥对传输的数据进行加密。著名的网络安全系统Kerberos采用的是(3)加密技术。公钥密码是(4),常用的公钥加密算法有(5),它可以实现加密和数字签名。
在指定字段或表达式中不允许出现重复值的索引是
请在【答题】菜单下选择【进入考生文件夹】命令,并按照题目要求完成下面的操作。注意:以下的文件必须都保存在考生文件夹下。文档“北京政府统计工作年报.docx”是一篇从互联网上获取的文字资料,请打开该文档并按下列要求进行排版及保存操作:
Inrecentyears,wavesofChinesefamilieschoosetosendtheirchildrenabroadtostudy.Isitagoodidea?Readtheexcerptca
最新回复
(
0
)