已知Ksp(AgCl)=1.8×10-10，Ksp(AgI)=1.0×10-16。下列关于难溶物之间转化的说法中错误的是( )
| A．AgCl不溶于水，不能转化为AgI |
| B．两种难溶物的Ksp相差越大，难溶物就越容易转化为更难溶的物质 |
| C．AgI比AgCl更难溶于水，所以AgCl可以转化为AgI |
D．常温下，AgCl若要在NaI溶液中开始转化为AgI，则NaI的浓度必须不低于 |
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