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[单选题]
支持多道程序设计的操作系统在运行过程中,不断地选择新进程执行来实现CPU的共享,但其中______不是引起操作系统选择新进程的直接原因。(1分)
A
执行进程的时间片用完
B
执行进程出错
C
执行进程要等待某一事件发生
D
有新进程进入就绪队列
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试题答案:
D
答案解释:
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