胶体颗粒具有双电层结构，内层为胶核吸附紧密的（）层，外层为吸附松散的（）层。
参考答案：固定（吸附）；扩散
取14.3g Na2CO3•10H2O溶于水配成100ml溶液，（列式并计算）
求：
（1）Na2CO3物质的量浓度？
（2）取出20ml该溶液用水稀释，使Na2CO3物质的量浓度变为0.004mol/L，求应该使用什么规格的容量瓶？
On the number line above, the segment from 0 to 1 has been divided into fifths, as indicated by the large tick marks, and also into sevenths, as indicated by the small tick marks. What is the least possible distance between any two of the tick marks
