实现分页式存储地址转换过程，在此基础上实现请求分页的地址转换。实现请求页式地址转换中出现的缺页现象时，用到的先进先出FIFO、最近最久未使用LRU、最佳OPT置换算法。 -Implementation paged memory address translation process, on the basis of the implementation of demand paging address translation.Implement type in the address translation request page page fault occurs, use FIFO FIFO, recently the longest unused LRU, best OPT replacement algorithm.