单项选择题

A （）is aformal set of rules for specifying the format and relationship when exchanging data among communicating devices.

A．protocol
B．language
C．program
D．command

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单项选择题
In general,a typical （）model is composed ofseveral phases, such as requirements analysis phase, general detailed design phase, implementation phase, system acceptancetesting phase.

A．waterfall
B．incremental
C．spiral
D．prototyping
单项选择题
Sofiware（）occurs following delivery ofa software product to the customer.

A．analysis
B．design
C．implementation
D．Maintenance
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