Maintenance activities include(74)。

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

[单选题] Maintenance activities include（74）.①making enhancements to software products②developing a new software product③correcting problems④adapting products to new environments（74）A．①②B．①③④C．②③④D．①②③④

[单选题]Maintenance activities do not include (74).(74)A． making enhancements to software productsB． developing a new software productC． correcting problemsD． adapting products to new environments

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You are now to write a proposal, whichmay include its aim, duration, participant

You are now to write a proposal, which may include its aim, duration, participan

[单选题]Maintenance activitiesinclude ( ) .A.making enhancements to software produc

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[单选题] Software maintenance is to do necessary modification，supplenemt，and completeness during software life circle．Among the following vary kinds of maintenance，which one has the maximum workload in a general way? (73) ．(73) A．relevance maintenanceB．compl