题目
A.ρ={R1(CSG),R2(CT),R3(THI),R4(HIC),R5(HSI)}
B.ρ={R1(CSG),R2(CT),R3(THI),R5(HIC)}
C.ρ={R1(CSG),R2(CT),R3(THI),R4(HSI))
D.ρ=(R1(CSG),R2(CT),R3(HIC),R4(HSI)}
第1题
A.ρ{R1(WY),R2(XZ)}
B.ρ{R1(WZ),R2(XY)}
C.ρ={R1(WXY),R2(XZ)}
D.ρ={R1(WX),R2(YZ)}
第2题
A.ρ={R1(AC),R2(ED),R3(B)}
B.ρ={R1(AC),R2(E),R3(DB)}
C.ρ={R1(AC),R2(ED),R3(AB)}
D.ρ={R1(ABC),R2(ED),R3(ACE)}
第4题
A.ρ={R1(W19,R2(XZ)}
B.ρ={r1(WZ),R2(XY)
C.ρ={R1(WXY),R2(XZ)}
D.ρ={R1(WX),R2(YZ)}
第5题
A.ρ={R1(AC),R2(ED),R3(AB)}
B.ρ={R1(ABC),R2(ED),R3(ACE)}
C.ρ={R1(ABC),R2(ED),R3(AE)}
D.ρ={R1(ACE),R2(ED),R3(AB)}
第9题
A.ρ={R1(WY),R2(XZ)}
B.ρ={R1(WZ),R2(XY)}
C.ρ{R1(WXY),R2(XZ))
D.ρ={R1(WX),R2(YZ))
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