若不考虑I/O设备本身的性能，则影响计算机系统I/O数据传输速度的主要因素是（ ）。
- A.地址总线宽度
- B.数据总线宽度
- C.主存储器的容量
- D.CPU的字长
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。地址总线宽度决定了CPU可以访问的物理地址空间，简单地说就是CPU到底能够使用多大容量的内存。CPU字长指CPU位时间内（同一时间）能一次处理的二进数的位数。数据总线负责计算机中数据在各组成部分之间的传送，数据总线宽度是指在芯片内部数据传送的宽度，而数据总线宽度则决定了CPU与二级缓存、内存以及输入／输出设备之间一次数据传输的信息量。
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