专业英语讲义.docputer ponents WhafsInAPC? 8Lesson3 CPU,MemoryandHardDisk 13Lesson4 PeripheralDevices 19SoftwarePartLesson5 OperatingSystemOverview 26Lesson6 WindowsXP 32Lesson7 Linux puterNumberSystem puterisofrecentorigin(some50years),putationwasbornlongback・Theearlistcalculationaidusedbyhumanbeingwasabacus・“abakosv(foraboardoratablet)which,inturn,wasprobablyderivedfromtheHebrew"abaq”・(1642).Hebuiltamechanicaldigitalcalculatortohelphisfatherwithhisbusiness・Therewasatoothedwheelforeachdigitandeachwheelhad10positions・・,,merciallyavailablemechanicalcalculatorisattributedtoLeibnitz(1671)・1(pletedin1694andcouldadd,subtract,multiply,,(1822).CharlesBabbagewasanEnglishman,,theCountessofLovelace,LordByron'sdaughter,washisgirlfriend,pletelyfascinatedbyBabbage'\
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