单项选择题

In which phase of the software engineering process is the Software Requirements Specification developed

A．definition phase
B．engineering
C．maintenance
D．development phase
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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
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
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