《计算机专业英语》课件Unit 2 Computer Hardware.pptVIP

这个命名是鉴于这么一个事实——数据在电子主存储芯片中可以随意存放和恢复，而且不管数据在何处——存放和恢复的时间差不多是相同的。 Notes to the Text 3. However, before the writing operation, all the storage cells of the chip must be erased to the same initial state by exposure to ultraviolet radiation. 然而，必须首先将(EPROM)芯片置于紫外线下擦除，使(EPROM)所有的存储单元都擦除为相同的初始状态，然后再进行写操作。 Notes to the Text Text C Input/Output Input/Output Input and output devices make it possible for human beings to interact with computers. The speed, capacity, and ease of use of input and output devices have a direct bearing on the performance of an entire information system. Input Technology Interactive Input Direct Input Speech Recognition Sensor Input Computer System Input Computer System Output Output Technology Display Output Printers for Document Output Impact Printer Non impact Printer Notes to the Text 1. Generally, an information system is activated by the input of data or information. Input can also deactivate processing, just like a light switch that turns off a light as well as turns it on. 通常，输入的数据或信息激活信息系统，就像灯的开关既可以开灯又可以关灯一样。 2. Home computer users may link their systems to thermometers, light detectors, and motion detectors to help control energy use and deter vandalism. 句中vandalism通常指破坏行为。此处系指非法入侵行为。 Notes to the Text 家庭电脑用户可能将他们的计算机系统与温度计、光探测器和监视器连接起来，以便控制能源的使用和防止外人非法入侵。 Notes to the Text 3. A good example is saving your files on a mass-storage device for later input to the computer.? 句中saving在这里是动名词短语。 将文件存储到海量存储设备上以便将来输入计算机，便是一个最好的佐证。 Notes to the Text 4. A common impact printer for microcomputers is the dot-matrix printer, which works by striking pins in a print element against the ribbon and paper. 句中print element系指打印头。 微型计算机常用的接触式打印机是点阵式打印机，它是驱动装在打印头上的打印针，对着色带和纸打印的。 Notes to the Text Materials Bar CPU的选购 用户都希望买到满意的计算机，但是用户的要求又各不相同。因此，购买计算机必须根据用户的实际需要、经济条件和个人的期望，认真选购计算机或者计算机部件。在计算机的所有部件中，CPU无疑是重要的部件之一，在选购CPU时，需要考虑质量、性价比、用途等因素，并通过综合考虑这些因素来选购一款合适的CPU。