单项选择题

(9) 下列命题中是简单命题(或称原子命题)的为

A.15
B.18
C.25
D.不确定
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单项选择题
A disk scheduling mechanism in an operating system causes the disk arm to sweepback and forth across the disk surface servicing all requests in its path. This is a
A.First Come First Serve
B.Shortest Seek Time First
C.Scan
D.None of the above
单项选择题
软件质量保证实施应贯彻软件开发的全过程,下述 Ⅰ.阶段复审 Ⅱ.材料复审 Ⅲ.软件测试 Ⅳ.管理复查 是保证软件质量必要措施的是
A.Ⅰ和Ⅱ
B.Ⅱ和Ⅲ
C.Ⅰ、Ⅱ和Ⅲ
D.全部
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