本文探讨了北海湾COD值的分布特征及其与水文、生物要素及不同形态氮、磷含量的关系。

This paper deals with the distributive characteristics of COD in Beihai Bay, and its relationship with hydrological and biological elements, states of nitrate and phosphate.

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将水坝对河流生态系统的影响因素划分为非生物要素和生物要素两大方面，并根据影响程度划分为三个等级；

Factors affected on dams were divided into two sections: abiotic factor and biotic factor, and the degree of effects was divided into three grades;

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固态白酒工艺要素按其功能和作用分为配料要素、环境要素和微生物要素三大类，各大类要素又分为若干子要素。

Technology elements of solid liquor are classified to three categories which are material ingredient, environmental and microorganism according to their functions.

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