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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单项选择题
Which phase of the software development requires the most development time
A．the design phase
B．the testing phase
C．the maintenance phase
D．the development phase
单项选择题
The Programming Counter(PC) is normally used to point out
A．The address of next execution instruction
B．The address of last execution instruction
C．The address of current execution instruction
D．Programmed execution instruction
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