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【单选题】
关系模式R,R的属性集是{ABCDEG}有函数依赖集F={AB->C , C->A, BC->D , ACD->B,BE->C,D->EG,CG->BD,CE->AG},计算(BD)+的属性闭包.
A.
BDEG
B.
BDC
C.
ABCDEG
D.
ABCD
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