单项选择题

There are two common types in page replacement algorithm: stack and non-stack strategies. When a real page number increase only stack algorithm can increase the hit rate monotonously. In the following replacement algorithm, which one belongs to non-stack strategy( ).

A．FIFO
B．LRU
C．PFF
D．OPT

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问答题

计算机除CPU和主存以外，其余所有部件均可归人输入输出系统，即1 O系统。所谓I O操作是指1 O设备与主存之间的信息交换。请回答下面的问题：(1)I O方式发展经历了哪些阶段(2)各阶段的工作原理及优缺点是什么

单项选择题

A memory--memory, machine instruction for a certain machine has the following format. (Such an instruction is similar to a register—register instruction except that the operands are displaced addresses in memory.) Which of the following could be an assembly language instruction that would be translated into a memory—to—memory instruction for this machine( ).

A．ADD 10(R1) ,20(R2)
B．ADD(10R1), (20R2)
C．ADD R1,10(R2),20
D．ADD R1,10,20(R2)

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