单选题 Which of the following items need not have unique values in the referencing relation? __________ 的答案
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题目内容：
Which of the following items need not have unique values in the referencing relation? __________
题目选项
参考答案价值：100%
题目内容：
Which of the following items need not have unique values in the referencing relation? __________
题目选项
参考答案价值：100%
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