单项选择题

软件维护的最主要部分是

A．校正性维护
B．适应性维护
C．完善性维护
D．预防性维护
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单项选择题
Which of the following statements is correct
A．The definition phase results in the Software Requirements Specificatio
B．Testing is optional in software life cycl
C．CASE tools can only aid in the design phase of a software life cycl
D．A change during a later phase does not require the documentation of all earlier phases to be update
单项选择题
下列作业调度算法中最短的作业平均周转时间是
A．先来先服务
B．短作业优先
C．最高响应比优先
D．优先数法
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