Bio - degradation role of aerobiotic organic substance and relationships between biological degradation and dissolved oxygen were stated, which provided theoretical basis for waste water reatment.

本文论述了需氧有机物的生物降解作用以及与溶解氧平衡的关系,从而为污水治理提供理论依据。

In order to prevent failure of packer and provide theoretical basis for selection of unsetting shear pin, the unsetting force of packer must he calculated in design.

为了防止封隔器在工作过程中失效，并为解封剪钉（或剪环）的选择提供理论依据，必须进行解封力的设计计算。

By making a primary orthogonal regression test, the major factor and best parameter combination were found out, which supply theoretical basis for further research on awn-removed principle and awner.

通过一次回归正交试验找出了影响除芒效果的主次因素和最佳参数组合，为进一步研究除芒机理与机具提供了依据。