self-puriifcaiton activity是什么意思

用法例句

Study on self-purification of the Second Songhua River polluted by mercury in past 20 years;

20年来第二松花江汞污染自净规律研究

Study on Self-purification Model of Soil System under Low-grade Contamination;

轻度污染下土壤系统自净过程的简化模型初探

A Study on Water-bloom and Self-purification in Small-scaled Urban Scenery Water;

城市小型景观水体水华成因及自净能力研究

Many minerals in nature have the self-purification capacity to hold and stabilize deleterious contaminant,which can be used to deal with heavy metal contaminants.

自然界中的许多矿物自身赋有容纳和稳定有害物质的自净化能力,可用于重金属类污染物的治理。

Intrusion Detection Basedon Self-purification Theory;

本文以统计方法为基础，水体自净思想为理论，遗传算法为工具。