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
Computer Mouse The basic computer mouse is an amazingly clever invention with a relatively simple design that allows us to p
Computer Mouse The basic computer mouse is an amazingly clever invention with a relatively simple design that allows us to p
admin
2011-01-02
68
问题
Computer Mouse
The basic computer mouse is an amazingly clever invention with a relatively simple design that allows us to point at things on the computer and it is very productive. Think of all the things you can do with a mouse like selecting text for copying and pasting, drawing, and even scrolling on the page with the newer mice with the wheel. Most of us use the computer mouse daily without stopping to think how it works until it gets dirty and we have to learn how to clean it. We learn to point at thing before we learn to speak, so the mouse is a very natural pointing device. Other computer pointing devices include light pens, graphics tablets and touch screen, but the mouse is still our workhorse.
The computer mouse was invented in 1964 by Douglas Englehart of Stanford University. As computer screens became popular and arrow keys were used to more around a body of text, it became clear that a pointing device that allowed easier motion through the text and even selection of text would be very useful. The introduction of the mouse, with the Apple Lisa computer in 1983, really started the computer public on the road to relying on the mouse for routine computer tasks.
How does the mouse work? We have to start at the bottom, so think upside down for now. It all starts with mouse ball. As the mouse ball in the bottom of the mouse rolls over the mouse pad, it presses against and turns two shafts. The shafts are connected to wheels with several small holes in them. The wheels have a pair of small electronic light-emitting devices called light emitting diodes (LED) mounted on either side. One LED sends a light beam to the LED on the other side. As the wheels spin and a hole rotates by, the light beam gets through to the LED on the other side. But a moment later the light beam is blocked until the next hole is in place. The LED detects a changing pattern of light, converts the pattern into an electronic signal, and sends the signal to the computer through wires in a cable that goes out the mouse body. This cable is the tail that helps give the mouse its name. The computer interprets the signal to tell it where to position the cursor on the computer screen.
So far we have only discussed the basic computer mouse that most of you probably have or have used. One problem with this design is that the mouse gets dirty as the ball rolls over the surface and picks up the dirt. Eventually you have to clean your mouse. The newer optical mice avoid this problem by having no moving parts.
The computer mouse derives its name from the cable that goes out its body, which looks like the tail of a mouse.
选项
A、Right
B、Wrong
C、Not mentioned
答案
A
解析
原文第三段倒数第二、三句指出,由于这个从鼠标中伸出的线缆像条尾巴一样所以鼠标因此而得名。
转载请注明原文地址:https://www.kaotiyun.com/show/yALd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
AnimportantpartofthenationalgovernmentistheForeignService,abranchoftheDepartmentofState.
MotherNatureShowsHerStrengthTornadoes(龙卷风)andheavythunderstormsmovedacrosstheGreatLakesandintoTrumbullCounty
’FeedMeBetter’WhenBritishTVchefJamieOliverlaunchedhis’FeedMeBetter’campaignin2004inschoolsintheGreenw
Newsecretariescameandwentwithmonotonousregularity.
ListeningtoBirdsongAmalezebrafinchchirpsawaytohimself.Suddenlyhenoticesafemalebirdnearby.Herealizesheha
HypertensionDrugsFoundtoCutRiskofStrokeAustraliandoctorsdeclaredMondaythatacocktailofsimpleantihypertensive
HypertensionDrugsFoundtoCutRiskofStrokeAustraliandoctorsdeclaredMondaythatacocktailofsimpleantihypertensive
OnBritishNewspapersBesidesthedailynewspapers,thereareanumberofSundaynewspapersinBritain.Manyofthemareconnect
Poorchildrenshouldnotbedeprivedoftheopportunitytoparticipateinsportswheneverpossible.
LightNight,DarkStarsThousandsofpeoplearoundtheglobestepoutsidetogazeattheirnightsky.Onaclearnight,withno
随机试题
MM命题I(无税)的一个关键假设是个人的借贷利率与公司相同。()
钨极氩弧焊按保护气体成分分为氩弧焊和氦弧焊。
粉末中可见晶鞘纤维的药材是
麻疹患者在出疹期首先出现皮疹的部位是
工程项目的招标工作应在()阶段完成。
期货公司应当有效执行期货投资咨询业务管理制度中的客户回访与投诉规定,明确客户回访与投诉的内容、要求、程序,及时、妥善处理客户投诉事项。()
融资需求预测的方法有()。[2018年9月真题]Ⅰ.回归分析Ⅱ.交互式财务规划模型m.综合数据库财务计划系统Ⅳ.可持续增长率模型Ⅴ.销售百分比法
2008年,传统汽车生产企业旭辉公司决定研发、生产国内第一款新能源汽车,此举在同行眼中无异于一种“逆风而上”的冒险行为。首先,对传统汽车企业而言,研发新能源汽车是一个全新的挑战。新能源汽车的驱动原理与传统燃油汽车有着本质性的区别。技术的不确定性以及业
“2015.北京人权论坛”2015年9月16日在京开幕。国家主席习近平发去贺信,强调实现人民充分享有人权是人类社会的共同奋斗目标。习近平强调,人权保障没有最好,只有更好。国际社会应该积极推进世界人权事业,尤其是要关注广大发展中国家民众的生存权和发展权。《中
设f(x)是连续函数,F(x)是f(x)的原函数,则
最新回复
(
0
)