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
66
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
Heisconsideredtobethemostdiligentstudentinclass.
ScientistsDevelopWaysofDetectingHeartAttackGermanresearchershavecomeupwithanewgenerationofdefibrillators(除颤
Thecontractbetweenthetwocompanieswillexpiresoon.
JapaneseCarKeepsWatchforDrunkDriversAconceptcardevelopedbyJapanesecompanyNissanhasabreathalyzer-likedetect
JapaneseCarKeepsWatchforDrunkDriversAconceptcardevelopedbyJapanesecompanyNissanhasabreathalyzer-likedetect
HypertensionDrugsFoundtoCutRiskofStrokeAustraliandoctorsdeclaredMondaythatacocktailofsimpleantihypertensive
DatafromVoyagerⅡhavepresentedastronomerswithapuzzleaboutwhyouroutermostplanetexists.
OnBritishNewspapersBesidesthedailynewspapers,thereareanumberofSundaynewspapersinBritain.Manyofthemareconnect
CellPhoneLetsYourSecretOutYourcellphoneholdssecretsaboutyou.Besidesthenamesand【C1】______thatyou’veprogra
Jackisadiligentstudent.
随机试题
A.多为单发病灶,以段叶分布B.常为多发病灶,两肺外带多见C.肺部病变继发感染所致D.肺结核空洞继发感染血源性肺脓肿
胎气上逆的主要证候,下列哪一项是错误的:
下列除哪项外,均为阴虚津亏型子淋的主证候
男性,64岁,无任何诱因突感上腹剧烈疼痛,持续1小时不缓解,伴恶心、呕吐,急诊心电图示Ⅱ、Ⅲ、aVF导联ST段弓背向上抬高。其原因可能是A.急性胆囊炎B.急性胰腺炎C.胃痉挛D.急性下壁心肌梗死E.急性前壁心肌梗死
新生儿,女,出生第5天,因全身冰冷,拒奶24小时入院。查体T35℃,反应差,皮肤是暗红色,心音低钝,双小腿皮肤如硬橡皮样,脐带已脱落。最可能的诊断是()。
收益性物业估价的市场法,适用的对象是()
计算行列式
Americaischangingitseatinghabits.【C1】______medicalevidencemountsthatweare【C2】______aboutwhatweeat,consumingaheal
A、Theyareexperiencingaseveredrought.B、WaterinCaliforniaispolluted.C、Theywanttoapplyanewtechnology.D、Theywant
A、Manychildrensuffergreatlyfrombraininjury.B、Manychildrenarethreatenedbylungcancer.C、Childrensuffermorefrombra
最新回复
(
0
)