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【单选题】
在关系模型中,对于关系性质正确的是( )A.
关系中每一个属性值都是可分解的
B.
关系中允许出现重复
C.
由于关系是一个集合，因此不考虑间的顺序，即没有行序。
D.
中的属性在理论上是有序的
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