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【单选题】
某个进程从等待状态进入就绪状态可能是由于 。A.
现运行进程执行了启动I/O指令
B.
现运行进程执行了wait操作
C.
现运行进程执行了signal操作
D.
现运行进程时间片用完
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so; that few of us can do
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