Spontaneous combustion of coal is an extremely complicated physical chemistry process and the moisture is the important factor of the influence of coal oxidation.
煤炭自燃是一个复杂的物理化学过程，煤的水分是影响氧化进程的重要因素。
According to the molecule orbital theory, the oxidation spontaneous combustion reaction of the low molecular compound in coal takes place at the atoms which charge density is thick.
根据分子轨道理论，煤中低分子化合物的氧化自燃反应发生在电荷密度较大的原子部位，计算得到了煤有机质中低分子化合物发生氧化自燃反应的活性点。
Exothermic oxidation of coal is the main cause of spontaneous combustion.
煤的氧化放热是引起煤自燃的主要原因。
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