【Key words】 Surface soil； Air Dust Near； the Ground； Irrigation Water Land； Classification Gradation；
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The implementation of agricultural land classification, gradation and valuation metadata system.
农用地分等定级估价元数据体系的实现。
Rock masses classification and gradation for dam foundation is one of the important engineering geological issues in Lixianjiang hydropower project, Yunnan, China.
云南李仙江石门坎水电站坝基岩体分级研究是该坝址工程地质问题研究的重要内容之一。
On the basis of studying on identification, classification, gradation of gas accident hazard, the structure of coal mine gas accident is analyzed by means of typical accident.
在研究瓦斯危险源辨识方法、分类分级方法的基础上分析煤矿瓦斯危险源系统结构，通过典型事故案例剖析煤矿瓦斯事故危险源系统结构。
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