单项选择题

What state is a process in when it can"t run because it needs a resource to become available

A．Ready
B．Interrupt
C．Blocked
D．Running
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单项选择题
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
A．5%
B．15%
C．20%
D．25%
单项选择题
Which of the followings is NOT a condition for deadlock
A．Starvation
B．Circular Wait
C．No Preemption
D．Mutual Exclusion
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