单选

●虚拟存储管理系统的基础是程序的 (28) 理论，这个理论的基本含义是指程序执行时往往会不均匀地访问主存储器单元。根据这个理论，Denning提出了工作集理论。工作集是进程运行时被频繁地访问的页面集合。在进程运行时，如果它的工作集页面都在 (29) 内，能够使该进程有效地运行，否则会出现频繁的页面调入/调出现象。
(28)

A．全局性 &n
bsp; B．局部性
C．时间全局性
D．空间全局性 (29) A．主存储器
B．虚拟存储器
C．辅助存储器
D．u盘

试题出自试卷《2011年程序员考试考前密卷（六）-上午试题》

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