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【单选题】
下列关于存储系统的描述中不正确的是( )。
A.
每个程序的虚地址空间可以远大于实地址空间,也可以远小于实地址空间。
B.
多级存储体系由cache、主存和虚拟存储器构成
C.
cache和虚拟存储器这两种存储器管理策略都利用了程序的局部性原理
D.
当cache未命中时,CPU可以直接访问主存,而外存与CPU之间则没有直接通路
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