计算机系统中，CPU对主存的访问方式属于（ ）。
- A.随机存取
- B.顺序存取
- C.索引存取
- D.哈希存取
正确答案及解析
正确答案
解析
微处理器以随机访问的方式访问主存，即按地址对主存中某一单元进行读、写。随机存取表示以同等时间存取一组序列中的一个随意元素，序列中的元素占用地址连续的存储空间，A选项正确；顺序存取是指访问信息时，只能按存储单元的位置，顺序地一个接一个地进行存取，序列中的元素不一定占用地址连续的存储空间，B选项错误；索引存取是指需要建立一个元素的逻辑位置与物理位置之间相对应的索引表，存取元素时先访问索引表，先获取元素存储位置的相关信息，然后再到元素所在的存储区域访问元素，C选项错误；散列存取是指按照事先设定的散列函数，根据元素的关键码计算出该元素的存储位置，D选项错误。
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