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
2012-07-30
71
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 things 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 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 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 me 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 detect 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 of 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
A
解析
短文的第三段说到,鼠标的部件有滚动部件如滚球,还有光电装置如二极管等。二极管将光信号转换为电信号,传送到计算机,计算机根据收到的电信号作出相应的反应,因此,二极管是鼠标的主要部件,而滚轮等只是辅助性的机械部件。题句对短文信息的推断是正确的,故答案为A。
转载请注明原文地址:https://kaotiyun.com/show/tlFd777K
本试题收录于:
职称英语综合类B级题库职称英语分类
0
职称英语综合类B级
职称英语
相关试题推荐
Scientistsfoundthatthebraincellsofalearningdisabledpersondifferfromthoseofanormalpersonin______.Whichofth
Sinceabout1970,newresearchhashelpedbrainscientistsunderstandstheseproblemsbetter.Scientistsnowknowtherearemany
HisnoveldepictsanambitiousAmerican.
AKeepingGoodRelationswithLocalBusinessmenBServiceProvidedbyLocalNewspapersCLargeCirculationoftheNationalNe
Olestraisasubstancethatmakesfoods’fat-freewhilekeepingthemdelicious.Somecriticssaythenewcompoundmayincrease
Itisestimatedthatwaterusewillriseby50%inthenext30years.Indiaexceedsenvironmentallimitsforwateruse.
Itwashardtosaywhythemandeservedsuch(shabby)treatment.
ACausesofChangesBIncreasingNumberofMuseumsandVisitorsCMuseumsGettingClosertoMoreSpectatorsDMoviesShowni
______isoriginallyaretrieverbutnowbecomesmainlyapet?______hastwocoats?
随机试题
以下物质能作为基准物质的是()。
以下疾病中,最容易并发脑血管栓塞的是()
2004年6月某星期天,甲运输公司司机乙在为公司拉货时,因为饮酒,开车将丙撞成重伤,乙肇事后逃跑。丙躺于地,神志不清,丁路过,见状,拦起一辆出租车,掏出50元给(个体)司机戊,要求司机将伤者拉往已医院救治,司机答应,并将丙拉到该医院门诊室,值班医生庚在二
买受人因拍卖标的存在瑕疵未声明的,在多长的时间内可以通过诉讼的方式请求赔偿?()
“生产成本”账户的贷方期末余额表示在产品成本。()
证券经纪业务营销人员在所服务证券公司的授权范围内从事客户招揽和客户服务等活动时,应()。Ⅰ.如实向客户传递所服务证券公司统一提供的研究报告及与证券投资有关的信息Ⅱ.向客户充分提示证券投资的风险Ⅲ.清晰、准确、客观地向客
客观事物不在眼前时,人们在大脑中重现出来的事物的形象称为()
微分方程y’=的通解是_________.
Wherewasthelionliving?
AUNESCOWorldCulturalHeritageSite,theTerracottaWarriorsandHorsesMuseumistheincrediblelegacyofthefirstemperoro
最新回复
(
0
)