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For the titration of a dibasic weak acid \( \mathrm{H}_{2} \mathrm{~A} \)
P \( \left(\mathrm{p}^{\mathrm{K}_{\mathrm{a}(2)}}-\geq 2\right) \) with a strong base, \( \mathrm{pH} \) versus volume

W of the base graph is as shown in the figure. The value of \( \mathrm{p}^{\mathrm{K}_{\mathrm{a}(1)}} \) and \( \mathrm{p}^{\mathrm{K}_{\mathrm{a}(2)}} \) may be equal to the \( \mathrm{pH} \) values corresponding to the points.
(1) B and D, respectively
(2) A and B, respectively
(3) \( \mathrm{C} \) and \( \mathrm{D} \), respectively
(4) A and C, respectively
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