题目内容
The waterfall model is so named because of the （ ）from one phase to another in the software development process.
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During design, problems with requirements are identified; during testing design problems are found
The waterfall model process is a simple linear model involves a sequence of iterations of the development activities.
For larger systems the waterfall model may be the best approach to development.
Exercise 1. Translate the sentences.Who is the teacher that is giving an economics class?
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