进行水化学分析并绘图，主要用的水利等方面　-Water chemical analysis and mapping, mainly used in water conservancy, etc.

化学数据双y轴作图方法及范例，给出了具体的作图方法和例子，其中，双y轴上是大于1条曲线，尚属首次出现-Double y-axis chemical data mapping methods and examples are given specific mapping methods and examples, which, more than double the y-axis is a curve, the first time appear