单项选择题

（）a method of obtaining early feedback on requirements by providing a working model of the expected product before actually building it

A、prototype
B、object oriented
C、structured method
D、iterative method

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单项选择题
After acceptance and formal transfer of information systems to customers it has entered the stage of （）

A、preparation
B、operation and maintenance
C、development
D、extinction
单项选择题
从任一节点走到相连的下一节点算一步，在下图中，从A节点到B阶段至少要走（）步。

A、4
B、5
C、7
D、6
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