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● 假设某计算机 CPU 在一秒发出 40 个磁盘 I/O 请求,这些请求(为 M/M/1 队列)的时间间隔按指数分布,平均磁盘服务时间为 20ms,则磁盘的平均利用率为 (58) ,磁盘请求的平均响应时间为 (59) ms。
(58)
A. 0.2
B. 0.4
C. 0.8
D. 1
(59)
A. 20
B. 25
C. 80
D. 100
A.2
B.4
C.8
【参考答案】
C,D
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● 以下列出的 IP 地址中,不能作为目标地址的是 (69) ,不能作为源地址的是 (70) 。 (69)A. 0.0.0.0 B. 127.0.0.1 C. 100.10.255.255 D. 10.0.0.1 (70)A. 0.0.0.0 B. 127.0.0.1 C. 100.255.255.255 D. 10.0.0.1
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● Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is (71). It determines how the various results are computed by the product and presents this information in the form. of a (72) and associated scenarios. The second is (73) , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is (74) , which determines the actions performed by or to each class or subclass and presents this information in the form. of (75) . (71)A.use-case modeling B. class modeling C. dynamic modeling D. behavioral modeling (72)A. collaboration diagram B. sequence diagram C. use-case diagram D. activity diagram (73)A. use-case modeling B. class modeling C. dynamic modeling D. behavioral modeling (74)A.use-case modeling B. class modeling C. dynamic modeling D. behavioral modeling (75)A. activity diagram B. component diagram C. sequence diagram D. state diagram
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