17、 Which of the following belongs to the conceptual data model?
(A)Hierarchical data model
(B) Network data model
(C) Relational data model
(D) Entity relationship model PRODUCT 主鍵:P_NUM P_NUM (產品代碼) P_NAME (產品名稱) P_PRICE (產品進貨價格) V_NUM (廠商代碼)

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統計： A(1), B(1), C(7), D(14), E(0) #872928