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
2011-01-05
73
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 (涂), 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 things before we learn to speak, so the mouse is a very natural pointing device. Other computer pointing devices include light pens, graphics (图形) tablets and touch screens, but the mouse is still our workhorse.
The computer mouse was invented in 1964 by Douglas Englehart of Stanford University. As computer screens became more popular and arrow keys were used to move 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 (常规) computer tasks.
How does the mouse work? We have to start at the bottom, so think upside down for now. It all starts with the mouse ball. As the mouse ball in the bottom of the mouse rolls over the mouse pad, it presses against and turns two shafts (轴). The shafts are conneected 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 (发现) a changing pattern of light, converts the pattern into an electronic signal, and sends the signal (发信号) 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 dirt. Eventually you have to clean your mouse. The newer optical mice avoid this problem by having no moving parts.
The key components of a computer mouse are the two LEDs.
选项
A、Right
B、Wrong
C、Not mentioned
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/uIQd777K
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
A.ourparentsB.cloudedvisionC.eyemusclesD.oureyesE.computeruseF.eyemoveSunlightinthesummerisbelievedtob
KnowingYourRealPersonalityfromSleepingPositionsEveryonehasgottwopersonalities—theonethatisshowntotheworld
PublicandPrivateSchoolsintheUniteStatesReligiousandprivateschoolsreceivelittleornosupportfrompublictaxes
Apparentlyininterviewsherefusestotalkabouthisprivatelife.
Penicillinwasdiscoveredbychancein1928.
HowDidSheConquertheAmericans?African-AmericantalkshowqueenOprahWinfreyistheworld’smostpowerfulcelebrity,ac
ManyphysiciansintheUSareself-employedprivatephysicians.BecomingaphysicianintheUScostsconsiderabletimeandmone
CTScansandLungCancerSmallorslow-growingnodules(小结节)discoveredonalungscanareunlikelytodevelopintotumors
HowDoAmericanConsumersBorrow?Youngconsumersoftenhavenotestablishedtheircreditratings.Manydonothavesteadyinco
随机试题
Postgraduatedilemmas[A]Decidingwhetherornottobecomeapostgraduatecanbeadaunting(令人畏缩的)prospect.Evenifyoua
下列选项中,不被法律认为是违法行为的是()
27岁女性,半年前中期妊娠引产,术后出现持续不规则的阴道流血,近2个月来咳痰、咯血,既往有肺结核史。妇科检查:子宫稍有增大,附件(-),X线胸片中两肺下叶有多个球形阴影。最有可能的诊断是
下列关于设计概算的描述,错误的是()。
()年10月8日,中国证监会发布并实施了《开放式证券投资基金试点办法》,由此揭开了我国开放式基金发展的序幕。
甲、乙、丙三人跑步比赛,从跑道起点出发,跑了20分钟,甲超过乙一圈,又跑了10分钟,甲超过丙一圈,问再过多长时间,丙超过乙一圈?()
从产品结构上,能反映出各个物料之间的从属关系和数量关系,它们之间的连线反映了______流程和时间周期。换句话说,通过一个产品结构就能够说明制造业生产管理用的“期量标准”。
电脑病毒是()。
MostpeoplewouldbeimpressedbythehighqualityofmedicineavailabletomostAmericans.Thereisalotofspecialization,a
Theproposalsbeingmadeaffect______.Productionengineersfromheadquarterscangiveinstructionstotheproductionengineer
最新回复
(
0
)