单项选择题

Maintenance activities include（ ）. ①making enhancements to software products ②developing a new software product ③correcting problems ④adapting products to new environments

A．①②
B．①③④
C．②③④
D．①②③④
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单项选择题
A well-designed system should be（ ）.①easily understood②reliable③straightforward to implement④straightforward to maintain
A．①②
B．①③④
C．②③④
D．①②③④
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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