单项选择题

The following sectors are requested from the disk:
11,1,36,16,34,9,12
What is the order of the sector reads if you are using the elevator algorithm

A．1,9,11,12,16,34,36
B．11,1,36,16,34,9,12
C．11,12,9,16,1,34,36
D．11,12,16,34,36,9,1
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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
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%
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