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【单选题】
25℃时，重水（D 2 O）的离子积为1.6X10 -15 ，也可用PH值一样的定义来规定其酸碱度：PD=-lg[D + ]，下列有关PD的叙述，正确的是（） ①中性D 2 O的PD='7' ②在1L D 2 O中，溶解0.01molNaOD，其PD值为12 ③1L0.01mol/L的DCl的重水溶液，PD='2' ④在100mL 0.25mol/L DCl的重水溶液中，加入50mL 0.2mol/L NaOD的重水溶液，反应后溶液的PD='1'A.
①②
B.
③④
C.
①③④
D.
①②③④
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