构成计算机系统内存的主要存储器件是( )。
- A.SRAM
- B.DRAM
- C.PROM
- D.EPROM
正确答案及解析
正确答案
解析
本题考查计算机系统基础知识。
随机存储器(RAM)分为静态随机存储器(SRAM)和动态随机存储器(DRAM)两类。其中,SRAM速度快,不需要刷新操作,缺点是集成度低价格高,在主板上不能作为用量较大的主存。DRAM是最为常见的内存储器,采用电容存储,其数据只能保持很短的时间,每隔一段时间需要刷新充电1次,否则内部的数据会丢失。
对于可编程的只读存储器(Programmable Read Only Memory, PROM),其内容可以由用户一次性地写入,写入后不能再修改。可擦除可编程只读存储器(Erasable Programmable Read Only Memory, EPROM)的内容既可以读出,也可以由用户写入,写入后还可以修改。常见的改写方法是先用紫外线照射15~20分钟以擦去所有信息,然后再用特殊的电子设备写入信息。
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