A.AIB.RDAC.EARD.RNIE.UL可以满足特定人群50％个体需要的摄入水平是
A.AI
B.RDA
C.EAR
D.RNI
E.UL
B.RDA
C.EAR
D.RNI
E.UL
可以满足特定人群50％个体需要的摄入水平是
参考解析
解析：
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给定关系模式R(U,F)，萁中：u为关系模式R中的属性集，，是u上的一组函数依赖。假设u={A1，A2，A3;A4)，F={A1→A2，A1A2→A3,A1→A4,A2→A4那么关系R的主键应为( 52 )。函数依赖集F中的( 53 )是冗余的。A.AI →A2B.AIA2→A3C.Al→A4D.A2→A4
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AI和RNl的区别是（ ）。A.AI的准确性大于RNIB.AI的准确性小于RNIC.AI的精密性大于RNID.AI的精密性小于RNIE.AI的精密性等于RNI