Maintenance activities include（74）.

①making enhancements to software products

②developing a new software product

③correcting problems

④adapting products to new environments

（74）

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 environmentsA．①②B．①③④C．②③④D．①②③④

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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

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[名词解释] 维持剂量（maintenance dose）

[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).A．relevance maintenanceB．completen