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
114
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
ContinuingMedicalEducationThereisincreasingrecognitionoftheneedforhealthworkerstocontinuetheireducationthro
StepBackinTimeDoyouknowthatwelivealotlongernowthanthepeoplewhowerebornbeforeus?Onehundredyearsagot
EbolaOutbreak1YouarelikelyawarethatseveralcountriesinWestAfricaarebattlinganEbolaoutbreak.Ebolaisadangerous
Whatistheeffectofexerciseonelderlypeoplewithtype2diabetes?Theresearcherscheckedhowwellthetestsubjects’insu
EffectsofExerciseonElderlyDiabetics(糖尿病人)Mostolderpeoplewith.so-calledtype2diabetes(糖尿病)couldstoptakingins
TheSpanishFluEpidemicIfyou’reworriedaboutthepossibilityofacomingbirdfluepidemic,youcantakecomfortinthef
SpareaKidney?Itisnolongerunusualforaspouseorrelativetodonateakidneyt0alovedone,butthenumberofAmer
ASocietywithoutaFormalAuthorityIntheseventeenthcentury,EuropeansoldierswhocameacrosssomeIndiangroupsinthewes
WhileattemptingtofindanewroutetoIndia,ColumbusdiscoveredAmericabyaccident.
随机试题
我国国家标准集装箱质量系列,采用5t、10t、20t、30t四种,相应的型号为5D、10D、1CC及_______。
标记<TH>的VAUGN属性缺省值为
为研究肺癌患者肺组织中的DNA加合物含量(个/108核苷酸)与吸烟的关系,某研究者用“同位素标记法”测定了12名肺癌患者肺组织中DNA加合物含量(y),并调查其每日吸烟量(x),结果如下表。以每日吸烟量为自变量x,肺组织中DNA加合物含量为应变量y进
流行性腮腺炎的传播途径是
路面垫层材料不要求强度高,但要求( )好。
甲公司为增值税一般纳税人,主要从事汽车销售和维修业务,2018年1月有关经济业务如下:(1)进口小汽车一批,取得海关进口增值税专用缴款书注明增值税税额187万元。(2)购进维修用原材料及零配件,取得增值税专用发票注明税额100.3万元,因保管不善部分原
事物度的原理,要求我们要注意“适度”的原则,根据情况决定能不能超越和破坏事物的度。()
撰写公文时使用文中强调语如“尤其值得注意的是”“不难看出”等,其目的是()。
依据现行宪法,下列自然资源不能属于集体所有的是()。
NowwhentalkingabouteconomicreformIamvery______awareoftheshadowhangingovermostAfricancountries’debt.
最新回复
(
0
)