置换算法最近最不经常使用（NRU）算法通过对页面、页表、地址转换和页面置换过程的模拟，加深对请求调页系统的原理和实现过程的理解。-Replacement algorithm is the least frequently used recently (NRU) algorithm through the pages, page tables, address translation and page replacement process simulation, to deepen the request paging system theory and realization of the process of understanding.