将体积为1mL，浓度为0.5mol/L的乙酸和体积为2mL，浓度为0.25mol/L的NaOH溶液混和，所得溶液中离子浓度由大到小的顺序是 （ ）
| A．c(Na+)>c(CH3COO-)>c (OH-)>c(H+) |
| B．c(Na+)＝c(CH3COO-)，c(CH3COO-)>c (OH-)>c(H+) |
| C．c(Na+)> c (OH-) > c(CH3COO-) >c(H+) |
| D．c(Na+)> c (OH-) > c(H+)> c(CH3COO-) |
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