已知0.02 mol/L^-1CH₃COOH溶液和0.01 mol /L^-1NaOH溶液以等体积混和后溶液呈酸性，则该混合液中微粒浓度关系正确的[ ]

A．c (CH₃COO^-)＞c (Na⁺)  

B．c (Na⁺) + c (H⁺) =c (OH^-) +c (CH₃COOH)+c (CH₃COO^-)

C．c (CH₃COOH)＞c (CH₃COO^-)  

D．c (CH₃COOH)+c (CH₃COO^-)=0.02 mol/L-1

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