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[单选题]

Suppose we have the relation schema R(A，B，C，D)with functional dependencies；F{A→B，B→C，C→D，D→A}，then R(A，B，C，

D．at least is in (73) ．(73)

A．1NF

B．2NF

C．3NF

D．BCNF

参考答案与解析：

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