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。
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According to the molecule orbital theory, the oxidationspontaneous combustion reaction of the low molecular compound in coal takes place at the atoms which charge density is thick.