单项选择题

The basic function of the file system is accessing files by names. The function can be realized by（）

A．directory—managing
B．boosting the speed of the file—accessing
C．file—protecting
D．improving the utilization of storage

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单项选择题
What refers to the page replacement algorithm which replaces the page that has not been used for the longest period of time （）

A．FIFO
B．LRU
C．OPT
D．LFU
单项选择题
The search method processed only on sequential storage is（）.

A．sequential search
B．binary search
C．tree search
D．hash search
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