计算机专业英语第二单元习题答案.doc

Unit 2 Computer Architecture Section A I．Fill in the blanks with the information given in the text: input; output; storage Basic Input Output System flatbed scanners; hand-held scanners LCD-based dot-matrix printers; inkjet printers disk drives; memory Volatile serial; parallel II．Translate the following terms or phrases from English into Chinese and vice versa: information retrieval 信息检索 voice recognition module 语音识别模块 touch-sensitive region 触感区 address bus 地址总线 flatbed scanner 平板扫描仪 dot-matrix printer 点阵打印机 parallel connection 并行连接 cathode ray tube 阴极射线管 video game 电子游戏 audio signal 音频信号 operating system 操作系统 LCD (liquid crystal display) 液晶显示（器） inkjet printer 喷墨打印机 data bus 数据总线 serial connection 串行连接 volatile memory 易失性存储器 laser printer 激光打印机 disk drive 磁盘驱动器 BIOS (Basic Input Output System) 基本输入输出系统 video display 视频显示器 III．Fill in each of the blanks with one of the words given in the following list, making changes if necessary: CD-ROM stands for compact disk read-only memory. Unlike floppy and hard disks, which use magnetic charges to represent 1s and 0s, optical disks use reflected light. On a CD-ROM disk, 1s and 0s are represented by flat areas and bumpy areas (called “pits”) on its bottom surface. The CD-ROM disk is read by a laser that projects a tiny beam of light on these areas. The amount of reflected light determines whether the area represents a 1 or a 0. Like a commercial CD found in music stores, a CD-ROM is a “read-only” disc. Read-only means it cannot be written on or erased by the user. Thus, you as a user have access only to the data imprinted by the publisher. A single CD-ROM disk can store 650 megabytes of data. That is equivalent to 451 floppy disks. With that much information on a single disk, the time to retrieve or access the information is very important. An important characteristic of CD-ROM drives is their access rate. Section B I．Fill in the blanks with the information given in the text: low-speed topology; hub control;