单项选择题

There are many page replacement algorithms in the page management. Most frequently used algorithm is

A．FIFO
B．PeT
C．OPT
D．LRU
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单项选择题
The principle for a stack memory to store data is
A．FIFO
B．FILO
C．random
D．other way
单项选择题
For the root of B_tree of order m,the minimal number of its children is
A．2
B．[m/2]
C．[m/2]
D．m
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