单项选择题

The process of software development doesn’t include ______.

A．verification function
B．writing code
C．management function
D．validation function
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单项选择题
A well-designed system should be ______. ①easily understood ②reliable ③straightforward to implement ④straightforward to maintain
A．①②
B．①③④
C．②③④
D．①②③④
单项选择题
Each box is an activity; the number it contains is the duration of the activity in days. The duration of the critical path is ______.
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