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.
引起极限扩散电流密度明显增加的临界磁场强度随三价铁离子浓度增加而减小。
The minimum magnetic field intensity needed to induce significant effect on cathodic limiting diffusion current density decreased with increasing ferric ion concentration.
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