单项选择题

假设系统处于下列安全状态,目前系统剩余资源数量为2。下列哪一个进程序列是安全序列?()

A.P1,P2,P3,P4
B.P1,P3,P4,P2
C.P3,P2,P4,P1
D.P3,P1,P4,P2

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单项选择题
下面的有向图,其结点可以排成多少个不同的拓扑序列?()

A.3
B.5
C.7
D.9

单项选择题
The Pentium includes hardware for both segmentation and paging. Both mechanisms can be disabled, allowing the user to choose from four distinct views of memory. Now the most frequently used view(such as Unix System V) is ().

A.Unsegmented unpaged memory
B.Unsegmented paged memory
C.Segmented unpaged memory
D.Segmented paged memory

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