单项选择题

If file A has the capability of 724,the same group’s users of file A may do

A．read A only
B．write A
C．execute A
D．non-operation
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单项选择题
Which of the following operations belongs to message passing
A．read and write
B．save and receive
C．wait and signal
D．P and V
单项选择题
How many key comparisons are needed in searching for key value 38
A．1
B．2
C．3
D．4
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