一个有两个作业管理进程的批处理系统,作业调度采用基于优先数(优先数大表示优先级别高)的算法,进程调度采用短作业优先的算法(按剩余运行时间计算作业的长短)。有以下作业序列:
作业F的运行结束时间为(23)(假定在作业运行期间,除了有空闲的作业管理进程以外,系统不进行调度工作)
(82)
(83)
(81)
(80)
(77)
Software design is a(71)process .It requires a certain(72)of flair on the part of the designer. Design can not be learned from a book .It must be practiced and learnt by experience and study of existing systems .A well(73)software system is straightforward to implement and maintain ,easily(74)and reliable .Badly(73)software systems ,although they may work are(75)to be expensive to maintain ,difficult to test and unreliable.
(78)
(75)
(76)
(66)is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group.
(67)is an error detection code that most data conlmunication networks use.
(68)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.
(69)is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or nonperiodic basis over a range of media.
(70)is an identifier of a web page.
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