某溶液中只存在OH-、H+、Cl-、NH4+ 四种离子，其离子浓度可能有如下关系。下列说法正确的是
①
②
③
④
| A．若①正确，则溶液中溶质一定为NH4Cl |
| B．溶质不同时，上述四种关系式均可能成立 |
| C．若④正确，且混合前盐酸和氨水体积相等，则盐酸中c(H+)等于氨水中c(OH-) |
D．若③正确，则溶液中 |
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