单项选择题

A disk scheduling mechanism in an operatingsystem causes the disk arm to sweepback and forth across the disk surface servicing all requests in its path. This is a

A．First Come First Serve
B．Shortest Seek Time First
C．Scan
D．None of the above
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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．ém/2ù
D．m
单项选择题
In the forest corresponding to the following binary tree，how many children does node B have？
A．1
B．2
C．3
D．4
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