说明：  实现进程的分页式内存分配和地址转换过程，并进一步实现请求分页式存储分配和地址转换过程。页面置换算法至少应实现先进先出（FIFO）、最近最久未使用（LRU）等算法
(Realization process of the paging type memory allocation and address translation process, and further realize request page type storage allocation and address translation process. Page replacement algorithm at least should be realized first in first out (FIFO), the most recent long not use (LRU) algorithm )