In the different years, the family 's expenditure on education and the family' s income have a positive coefficient and their elastic coefficient is more than 1.
不同年度家庭教育支出与家庭收入呈正向变动关系，二者的弹性系数大于1。
2
Polymer elastic granule SD-1, has great hydroscopicity, was introduced to fill and squeeze and to enhance plug intensity on the traditional techniques.