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
84
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
Plantswillemitanincreasedamountofheatwhentheyareinpoorphysicalcondition.Infraredscanningtechnologymaybebrou
Whatisthemaintopicofthepassage?Accordingtothepassage,whatisarelativelynewfocusinarchaeology?
ComputersBeforethewidespreaduseofcomputers,managerscouldnot(51)fulluseoflargeamountsofvaluableinformationabo
Theword"mirror"inthefirstlinecouldbebestreplacedbyBruceHardyhasbeenworkingwithAlthouseBusCompany
EveryDogHasItsSayKimikoFukuda,aJapanesegirl,alwayswonderedWhatherdogwastryingtosay.Wheneversheputonmak
Ordinaryplantsareunabletosurviveinthedesertmainlybecauseofthechangeableweather.Theshootsystemofperennialsca
Theystrolledaroundthelakeforanhourorso.
Thereisnogoodplacetohaveacarcrash--butsomeplacesareworsethanothers.Inaforeigncountry,forinstance,(1)toex
(46)Theanswerdependsonwhatkindofsystemisultimatelyadopted.(47)Thefirstisaspecial-purposelanesystem,inwhichcer
CrashedCarstoTextMessageforHelpThereisnogoodplacetohaveacarcrash--butsomeplacesareworsethanothers.I
随机试题
压力容器的实验压力是工作压力的()倍,即安全系数。
异嗜性抗原广泛存在于
将氟尿嘧啶制成去氧氟尿苷的目的是
病先见持续高热,面红目赤,后突然见肢厥面白,脉微欲绝,证属
项目策划决策阶段的融资咨询主要是从()的角度,通过分析研究提出项目的融资方案,为投资决策服务。
企业内部研究开发项目开发阶段的支出确认为无形资产应同时满足的条件有()。
质量管理是指在质量方面的管理指挥和控制组织协调的活动,它的主要活动包括()。
下列不属于我国大飞机三剑客的是()。
在△ABC中,a,b,c分别为内角A,B,C对边且b2+c2-a2=bc。设函数f(x)=,当f(B)取最大值时,判断△ABC的形状。
ThedefectsoftheBiblemaybecausedby______.
最新回复
(
0
)