通过在塑料中加入纳米添加剂，进行混合改性处理，使塑料管材的技术性能达到煤矿井下的使用标准。
When nanometer additive agent is added into plastic and the plastic is mixed and improved, the technical performance of the plastic pipes can reach the use standard in coal mines.
通过实验，对煤矿井下存在的多元混合气体的爆炸极限和临界氧浓度进行了分析和研究。
The paper experimentally studied the explosive limit and the critical oxygen concentration of several kinds of gases that are found in the mine.
在井下作业中，原油、废水与地表土壤及铺垫井场地面的废钢渣等相混合，形成了特殊的作业井场含油固体废物。为此，采用了两种处理方法对该类含油固体废物进行综合治理研究。
During a well workover, the oily solid contaminant in the well field is composed of crude oil, waste water, surface soil and waste steel sludge spread on the well field.
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