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【单选题】
关于“虚拟存储”概念，下列有关说法不正确的是 。A.
虚拟存储的功能之一就是要在小内存空间中运行大型程序 。
B.
虚拟存储可以在没有任何物理内存的情况下虚拟足够大的内存空间来运行程序。
C.
段页式存储管理系统也属于虚拟存储的一种重要实现方式。
D.
对时间有严格时限要求的实时操作系统不适合采用虚拟存储管理系统。
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