题目内容
A _________ conversion introduces the new system in one part of the organization.
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A _________ conversion introduces components of the new system in stages.
A _________ conversion involves running the old and new systems at the same time.
_________ is a systems development method that can combine tools to rapidly produce a high-quality system.
_________ is a software development methodology that delivers functionality in rapid iterations which are usually measured in weeks.
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