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

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单项选择题
Sofiware（）occurs following delivery ofa software product to the customer.

A．analysis
B．design
C．implementation
D．Maintenance
单项选择题
（）is the process ofarranging a group of data elements into some desired order.

A．File
B．Record
C．Sorting
D．Database
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