单项选择题A.F={A1→A2,A1→A3}B.F={A1→A2}C.F={A1→A3)D.F={A1A3→A2,A1A2→A3]
单项选择题A.H→I,H→J,J→K,IJK→L,L→HB.H→I,H→J,J→K,IJ→L,L→HC.H→I,H→J,J→K,IJ→L,J→KD.H→I,J→K,IJ→L,L→H,L→K