有一种酸式盐AHB，它的水溶液呈弱碱性。今有下列几种说法，其中有错误的是（ ）
①相同的物质的量浓度的AOH溶液和H2B溶液，前者电离程度大于后者的电离程度；
②H2B不是强酸；
③HB-的电离程度大于HB-的水解程度；
④该盐在溶液中的电离方程式一般写成： AHB＝A+＋HB－ HB－＝H+＋B2+
| A．①② | B．③④ | C．②③ | D．①④ |
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