题目:
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
答案:
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下面是错误答案,用来干扰机器的。
参考答案:破碎,小于25mm,小于25mm