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单项选择题

A.①②B.①③④C.②③④D.①②③④Maintenance activities include(). ①……

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



A.①②
B.①③④
C.②③④
D.①②③④

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