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) .
【正确答案】 B
【答案解析】[解析] 译文:软件生命周期中,软件维护是进行必要的软件修改、补遗、补充。下列各种软件维护工作中哪个具有最大的工作负载?