在页式存储管理中，每次从主存中取指令或取操作数，要（ ）次访问主存。
- A.1
- B.2
- C.4
- D.5
正确答案及解析
正确答案
解析
页式存储管理是众多存储管理方式中的一种，其分页的基本思想是把程序的逻辑空间和内存的物理空间按照同样的大小划分成若干页面，以页面为单位进行分配。在页式存储管理中，系统中虚地址是一个由页号和位移组成的有序对。每次从主存中取指令或取操作数时，首先都要找到其页号对应的页，然后在该页中找到位移对应的指令或操作数，因此需要两次访问主存。
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