A:c(Na+)>c (CH3COO-)>c(OH-)>c(H+)
B:c(CH3COO-)>c(Na+)>c(H+)>c(OH-)
C:c(Na+)=c(CH3COO-)+c(CH3COOH)
D:c(H+)=c(CH3COO-)+c(OH-)
6×3=____