在软件生命周期中,能准确地确定软件系统必须做什么和必须具备哪些功能的阶段是______。
A) 概要设计
B) 详细设计
C) 可行性设计
D) 需求分析
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类是具有共同属性、共同操作方法的对象的集合,所以类是对象的______。
It is the shopkeeper’s responsibility to take the complaint seriously and to replace or repair a faulty article or put right poor service, because he is the person with whom you have entered into an agreement.