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【单选题】
关系数据模型的三个组成部分中不包括()A.
关系的完整性约束
B.
系的数据操纵
C.
系的数据结构
D.
系的并发控制
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A.
should be cheated
B.
are being cheated
C.
are cheating
D.
should have been cheated
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