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
68
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 optical mouse is superior to the basic one in that the former has no moving parts.
选项
A、Right
B、Wrong
C、Not mentioned
答案
A
解析
原文是:“The newer optical mice.avoid this problem by having no moving parts.”新型的光电鼠标避免了老式鼠标无移动部件的缺点。
转载请注明原文地址:https://kaotiyun.com/show/VALd777K
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
ScientistsDevelopWaysofDetectingHeartAttackGermanresearchershavecomeupwithanewgenerationofdefibrillators(除颤
A.ingoodhealthB.inthepastC.inthewrongD.theoldmanE.amiddle-agedmanF.ayoungmanMoreresearchshouldbedon
HypertensionDrugsFoundtoCutRiskofStrokeAustraliandoctorsdeclaredMondaythatacocktailofsimpleantihypertensive
ListeningtoBirdsongAmalezebrafinchchirpsawaytohimself.Suddenlyhenoticesafemalebirdnearby.Herealizesheha
Attheageof30,Herseysuddenlybecameacelebrity.
HypertensionDrugsFoundtoCutRiskofStrokeAustraliandoctorsdeclaredMondaythatacocktailofsimpleantihypertensive
HypertensionDrugsFoundtoCutRiskofStrokeAustraliandoctorsdeclaredMondaythatacocktailofsimpleantihypertensive
HypertensionDrugsFoundtoCutRiskofStrokeAustraliandoctorsdeclaredMondaythatacocktailofsimpleantihypertensive
DriedFoodsCenturiesago,mandiscoveredthatremovingmoisture(51)foodhelpedtopreserveit,andthattheeasiestwaytodot
LookingtotheFuture—2040Doyouforgettoturnoffthelightsandheaterswhenyougooutofaroom?In2040itwillnot
随机试题
肠结核最好发于
某家电销售企业为增值税一般纳税人。2015年6月H型空调80台,每台含税价款2925元;采取“以旧换新”方式销售同型号空调20台,每台旧空调作价585元,实际每台收取款项2340元。根据增值税法律制度的规定,该企业当月上述业务增值税销项税额为(
阅读下文,回答问题。
建筑工程监理工作的三控制两管理五个内容中的“两管理”是指对()管理。
便于计算机辅助投资控制的偏差分析方法是()。
房屋租赁期限届满,租赁合同终止。承租人需要继续租用的,应当在租赁期限届满前()个月提出,并经出租人同意,重新签订租赁合同。
长期以来,我国城市管理执法体制弊端多多,部门林立,各管一摊。管市容的不管破坏绿化的,管破坏绿化的不管违章建设,管违章建设的不管街头无照摆摊……而许多违法问题的处理又常常涉及几个执法部门。比如,对于马路市场,工商、交通、市容等执法部门都可以管,又都可以不管。
齐次线性方程组的系数矩阵为A,存在B≠O,使得AB=O,则()。
在考生文件夹下,打开文档Wordl.docx,按照要求完成下列操作并以该文件名Wordl.docx保存文档。将正文各段文字(“在工业控制…采样和量化。”)设置为小四号仿宋;各段落悬挂缩进2字符、段前间距0.5行、行距为1.25倍。
IfyouaretakingaEnglishexam,donotonlylearn21.______rulesofgrammar.TrytoreadstoryinEnglish.
最新回复
(
0
)