During the combustion process of coal, the nitrogen element in coal may turn to various oxides of nitrogen, thereby, resulting in ambient pollution.
煤中氮元素在煤燃烧过程中会转化为各种氮的氧化物，从而造成环境污染。
The influence of fuel gases concentration and ambient temperature on combustion velocity and time are studied.
定量地计算了可燃物浓度、环境温度与反应速率、反应时间的关系；
The spontaneous combustion and explosion of AN-based explosives lies the crux of safety problem of in the presence of sulphidic minerals and high ambient temperature.
硝酸铵基混合炸药的自燃自爆问题，是硫化矿及高温条件下爆破安全问题的关键所在。
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