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1数据模型定义子数据库中数据的组织、描述、存储和操作规范,可以分为概念模型、数据结构模型和物理模型三大类。概念模型的典型代表是(A)实体-联系模型 (B)关系模型(C)面向对象模型 (D)网状模型
問題詳情
1数据模型定义子数据库中数据的组织、描述、存储和操作规范,可以分为概念模型、数据结构模型和物理模型三大类。概念模型的典型代表是
(A)实体-联系模型
(B)关系模型
(C)面向对象模型
(D)网状模型
參考答案
答案:A
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
上一篇 :
【題組】38.(A) tried(B) asked(C) waited(D) invited
下一篇 :
30.I hope you don’t mind me asking, _____ where did you buy those shoes?(A) so (B) and (C) yet (D) b
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【題組】49.(A) careful(B) mad(C) determined(D) helpless
【題組】58. What message can we get from the two photos in the magazine?(A) Gorillas are man’s close fri
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【題組】50.(A) save(B) reduce(C) protect(D) stop
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【題組】41.(A) frequent(B) regular(C) unusual(D) particular
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