Assume that an operating system uses a round—robin scheduler. The process’s quantum is 20 msec, and the context switch is 5 msec

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问题 Assume that an operating system uses a round—robin scheduler. The process’s quantum is 20 msec, and the context switch is 5 msec. What percentage of the CPU’s time is spent on administrative overhead? (    )

选项 A、5%.
B、15%.
C、20%.
D、25%.

答案C

解析
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