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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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
单项选择题
Which traversal method for a binary tree does the following Pascal code illustrate procedure traverse(p:pointer);beginit p＜＞nilthen begintraverse(p↑.left);process(p);traverse(p↑.right)endend;
A．Inorder
B．Preorder
C．Postorder
D．Reorder
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