计算机专业英语unit1.ppt

1、计算机的演进 Punch card ABC ENIAC GUI PC 2、Key words and Expressions (page 4） 1. Remember the key words and expressions of Passage A 记住Passage A所学的一些单词及短语 2. Complete the exercises on Page 5 3. 预习passage B(P6),小组作业，制作ppt，讲解系统单元（System知识。 DVD DVD-ROM discs (DVD = Digital Versatile Disc)(光碟) are optical storage media similar to CD-ROMs, but with a higher storage capacity. DVDs use smaller spots to record data, and the disks can be dual-layer and double-sided, with each layer holding 4.7?GB of data (so a dual-layer/double-sided DVD can hold 18?GB of data). Like CDs, DVDs also have recordable variants, although there are still multiple formats (DVD-R and DVD+R) competing for dominance. A single-layer DVD-R can hold 4.7?GB of data (Dual Layer discs can hold twice as much). DVD drive speeds are rated in terms of how many times faster that the original DVD drives they are (a 6?×?DVD drive is 6 times faster). Key Words and Expressions sequential [sikwen??l] a. 连续的(序贯的) volatile [v?l?tl] a. 反复无常的，挥发性的 microchip [maikr?ut?ip] n. 微芯片，微型集成电路片 storage capacity [st?:rid?] [k?p?siti] 存储容量，蓄电池容量，贮藏能力，积聚电容 incorporate [ink?:p?reit] a. 合并的，公司组织的，具体化的 v. 合并，组成公司，具体表现 floppy diskette [fl?pi] [disket] 软盘 fingerprints [fi?g?print] n. 指纹，指印 SDRAM (Synchronous Dynamic RAM) 同步动态随机存取存储器 DDR SDRAM (Double-Data-Rate SDRAM) 双倍数据传输率同步动态随机存取存储器 start up (boot up) 开动，开始工作，突然出现，出发，开办，启动 BIOS (Basic Input Output System) 基本输入/输出系统 flash memory card 闪存卡 CD-ROM (Compact Disc Read Only Memory) (只读)光盘驱动器 CD-R (Compact Disc-Recordable) 可擦写光盘 CD-RW (Compact Disk-ReWritable) 可重复读写光盘 DVD (Digital Versatile Disc) 数字通用光盘，影碟，光碟 Notes [1] ?ROM does not need power to remember its contents, so this is where a computer stores the programs that are needed to start up (boot up) the computer system. 只读存储器不需要电源就能记住存储的内容，因此常用于存储计算机系统启动时所需的一些程序。 [2] A small plastic slider can be slid to unblock a hole in the corner of th