A.需求分析 B.概念設(shè)計 C.邏輯設(shè)計 D.物理設(shè)計
A.動作(action) B.事件(event) C.轉(zhuǎn)移(transition) D.類(class)
A.泛化關(guān)系(Generalization) B.實現(xiàn)關(guān)系(Realization) C.包含關(guān)系(Inclusion) D.聚集關(guān)系(Aggregation)