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、How fax machines got a license. B、Who invented fax machines. C、How fax machines developed and worked. D、Where to buy the first
A、How fax machines got a license. B、Who invented fax machines. C、How fax machines developed and worked. D、Where to buy the first
admin
2012-07-05
78
问题
Most people might think that the fax machine, found in many offices and homes, is a relatively new piece of technology. In fact, a license for the fax machine was issued in 1843, 33 years before the telephone! A Scottish clockmaker, Alexander Bain, invented this device in the same year that the first telegraph message was being sent across America.
Although Bain worked out the method, he never actually sent a fax transmission. It was not until 1865 that the first working fax machines and transmission service were setup. (34) An Italian man named Giovanni Casel-li developed the "pan-telegraph" which was used to send pictures and writing between French cities.
The way that a fax machine works is quite straightforward. A machine scans horizontally across the sheet one line at a time—like your eyes when you’re reading a book. If the machine sees a white patch it records a 0, and if it sees a dark patch it records a 1. In this way the whole page is "digitized" into a string of 0s and Is. (35) A modem turns this into a series of high or low pitched sounds that are sent down the phone line to a remote receiver. At the other end, the sounds are turned back into 0s and 1s. These are printed onto a piece of paper as light or dark dots, and so the original picture is reproduced hundreds of miles away.
33. What is the main topic of the passage?
34. What was the "pan-telegraph" first used for?
35. What do we learn about the modem?
选项
A、How fax machines got a license.
B、Who invented fax machines.
C、How fax machines developed and worked.
D、Where to buy the first-class fax machines.
答案
C
解析
题干询问文章的主题是什么。短文中提到了传真机的发展史以及它工作的原理,故答案为C)。
转载请注明原文地址:https://kaotiyun.com/show/Wm57777K
0
大学英语四级
相关试题推荐
Asubjectwhichseemstohavebeeninsufficientlystudiedbydoctorsandpsychologistsistheinfluenceofgeographyandclimate
Mostchildrenwithhealthyappetitesarereadytoeatalmostanythingthatisofferedthemandachildrarelydislikesfood【C1】_
A、Onabusystreet.B、InaHongKonghotel.C、Atanairport.D、Atabookingoffice.C细节推理。男士向别人求助,希望被告知飞往香港的910航班的9号登机口怎么走,即可推断
Manyayoungpersontellsmehewantstobeawriter.Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdiff
Weallsufferfromstress.Therearemanypointswhentheremaybe【B1】______stress.Perhapswefeelitattimesof【B2】______,or
Today’slectureisonthesubjectofPronunciationAchievementFactors.Asanintroductionweshouldaskourselvesthreeque
A、Shepaid¥40.00forthecoat.B、Herhusbandpresentedittoherasagift.C、Sheboughtthecoatonherfortiethbirthday.D、H
A、Countandcalculatemoney.B、Readandwrite.C、Alertmovingobjects.D、Huntandfarm.D
Willthisshirt______inthewash?I’veboughtseveralshirtswhicharetoosmallformenow.
A、Talkwiththemanforafewminutes.B、Signtheleaseassoonaspossible.C、Readtheleasemorecarefully.D、Makesomenewit
随机试题
住院病案书写基本要求叙述不正确的是
A.三拗汤B.二陈汤C.麦门冬汤D.增液汤E.四物汤杏苏散中含有
甲在国外旅游,见有人兜售高仿真人民币,用1万元换取10万元假币,将假币夹在书中寄回国内。(事实一)赵氏调味品公司欲设加盟店,销售具有注册商标的赵氏调味品,派员工赵某物色合作者。甲知道自己不符加盟条件,仍找到赵某送其2万元真币和10万元假币,请其帮忙
个人取得下列所得,应按“个体工商户生产经营所得”缴纳个人所得税的是()。
当前,农村中大量留守儿童和父母特别是和父亲常年分离.很多城市里的父亲也因为工作和生活压力巨大,将教养孩子的责任几乎全推给了母亲。但是,父爱长时间、经常性的缺席,对孩子成长的负面影响不可小视。在亲子交流中,父亲的教育往往更偏重于生存能力、抗挫能力和社会责任,
唐高宗李治在位时期完成的《唐律疏议》是一部极为重要的法典,全面体现了中国古代法律制度的______、风格和基本特征,成为中华法系的______性法典,对后世及周边国家产生了极为深远的影响。依次填入划横线部分最恰当的一项是()。
陈某趁珠宝柜台的售货员接待其他顾客时,伸手从柜台内拿出一个价值2300元的戒指,握在手中。然后继续在柜台边假装观看。几分钟后售货员发现少了一个戒指并怀疑陈某,便立即报告保安人员。陈某见状,速将戒指扔回柜台内后逃离。关于本案,下列哪一说法是正确的?
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
【B1】【B12】
Hewasintelligentenoughto______thephysicsscholarship.
最新回复
(
0
)