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【单选题】
指出下列关系模式是第几范式( ):R(X,Y,Z) FD={ Y —— > Z, Y —— > X, X —— > YZ }A.
1NF
B.
2NF
C.
3NF
D.
BCNF
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A.
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B.
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C.
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D.
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A.
60
B.
120
C.
180
D.
240
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【单选题】In the last paragraph, when the author mentions 'the King,' he must refer to ______.
A.
the English King
B.
the French King
C.
the German King
D.
none of the Kings mentioned in A, B and C
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