模拟内存换页算法，包括FIFO（先进先出first in first out）,OPT(动态分配optimal),LRU(最近不使用latest use recently),LFR(最近最低频率lowest frequency recently),NUR(最近不使用no used recently）-Analog memory paging algorithms, including FIFO (first in first out first in first out), OPT (dynam