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
60
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.
The key components of a computer mouse are the two LEDs.
选项
A、真
B、假
C、Not Given
答案
A
解析
利用题干句中的特征词two LEDs搜索原文,发现他们出现在原文第三段后半部分,内容是关于两个发光二极管在鼠标中的具体工作方式。第三段说道: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。题干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/NpAR777K
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
信息系统开发的核心成果是_________。
Therearea______(surprise)largenumberofmistakesinthetestpaper.
Amongthecompanywasalawyer,ayoungmanofabouttwenty-five.Onbeingaskedhisopinion,hesaid,“Capitalpunishmentandlife
Thegovernmentisplanningto______(simple)thetaxlaws.
Weallbelievethatmodemtechnologycanmakelifebetterbecauseitmakeseverythingfaster.Butby(11)______everythingup,
Weallbelievethatmodemtechnologycanmakelifebetterbecauseitmakeseverythingfaster.Butby(11)______everythingup,
A.hashadbothhighlightsandhigherlightsB.twooftheworld’sbestviolinsC.hiscollaborativeeffortswithsomeoftoday’
A.hashadbothhighlightsandhigherlightsB.twooftheworld’sbestviolinsC.hiscollaborativeeffortswithsomeoftoday’
TheSalinityofOceanWaterIfthesalinityofoceanwaterisanalyzed,itisfoundtovaryonlyslightlyfromplacetoplac
TheSalinityofOceanWaterIfthesalinityofoceanwaterisanalyzed,itisfoundtovaryonlyslightlyfromplacetoplac
随机试题
根据行政管理规范的产生方式与运行机制相结合的标准,行政管理规范一般可以划分为两种基本类型,即()和()。
A.红霉素B.青霉素GC.氨基糖苷类抗菌药D.耐青霉素酶的半合成青霉素肺炎克雷伯杆菌肺炎的首选治疗药物是
工程建设监理实施细则应在工程施工开始前编制完成,并必须经()批准。
在确定最佳现金持有量的决策过程中不需要考虑的是()。
假定某工业企业设有机修和供电两个辅助生产车间,采用交互分配法进行辅助生产费用的分配。2015年5月在分配辅助生产车间费用以前,机修车间费用1200万元,按修理工时分配费用,提供修理工时500小时,其中,供电车间耗用20小时,其余的为基本生产车间以及行政管理
位于建制镇的某公司主要经营农产品种植、销售业务,公司占地3万平方米,其中农产品的种植用地2.5万平方米,职工宿舍和办公用地0.5万平方米;房产原值300万元。公司2007年发生以下业务:(2)6月30日签订房屋租赁合同一份,将价值50万元的办公室从7
反映学生在群体中的地位的测验是()
地理老师讲到地形时,使用彩色图片的效果比只用黑白图片的效果好,这主要体现了知觉的()。
强调心理学不应该以意识为主要研究对象的学派是()。
【B1】【B9】
最新回复
(
0
)