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
自考
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
2013-09-17
49
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 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 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 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.
According to the author, general computer users need not know how the computer mouse was invented.
选项
A、真
B、假
C、Not Given
答案
C
解析
利用题干句中的特征词general computer users,invented作为线索,在文中查找相关句,发现文章中没有出现与题干句的内容相呼应的信息,因此判断题干句的内容在文章中没有被提到。
转载请注明原文地址:https://jikaoti.com/ti/l0tfFFFM
本试题收录于:
英语(二)题库公共课分类
0
英语(二)
公共课
相关试题推荐
产品生产与库存系统数据库E—R图如题43图所示。写出关系数据库逻辑模型,并用下划线标志主码。
Onlinelearningisalsocalleddistanceeducation,whichhelpsstudentswhotakeclassesbycomputerovertheInternettolearnc
Weallbelievethatmodemtechnologycanmakelifebetterbecauseitmakeseverythingfaster.Butby(11)______everythingup,
Oneofthemostpotent(有效的)elementsinbodylanguageiseyebehavior.Americansarecarefulabouthowandwhentheymeetoneano
Allflights______becauseofthestorm,theydecidedtogotoBeijingbytrain.
TherewasateapotfashionedlikeaChinaduck,outof______openmouththeteawassupposedtocome.
A.hashadbothhighlightsandhigherlightsB.twooftheworld’sbestviolinsC.hiscollaborativeeffortswithsomeoftoday’
A.hashadbothhighlightsandhigherlightsB.twooftheworld’sbestviolinsC.hiscollaborativeeffortswithsomeoftoday’
Inrecentyearsadvancesinmedicaltechnologyhavemadeitpossibleforpeopletolivelongerthaninthepast.Newmedicinesa
Inrecentyearsadvancesinmedicaltechnologyhavemadeitpossibleforpeopletolivelongerthaninthepast.Newmedicinesa
随机试题
(-∞,2)
我国流行性出血热的主要宿主是
15周岁的甲非常喜爱计算机,于某日深夜潜入一公司内盗窃价值3万余元的计算机元器件(事发后均被追回)。对甲应当如何处理?( )
某办公楼工程,建筑面积35000m2,地下2层,地上15层,框架筒体结构,外装修为单元式玻璃幕墙和局部干挂石材。场区自然地面标高为-2.00m,基础底标高为-6.90m,地下水位标高-7.50m,基础范围内土质为粉质黏土层。在建筑物北侧,距外墙轴线2.5m
公司因股东会或者股东大会决议解散的,应当自解散事由出现之日起15日内成立清算组,开始清算。( )
《中学教师专业标准(试行)》确定的教师专业能力包括哪几个方面?
下列与岩浆岩有关的说法错误的是:
下面哪些效应属于来自被试方面的额外变量()。
Completeeachsentencewiththecorrectending,A-F,below.Writethecorrectletter,A-F,inboxes37-40onyouranswersheet.
Astheplanecircledovertheairport,everyonesensedthatsomethingwaswrong.Theplanewasmovingunsteadilythroughtheair
最新回复
(
0
)