The hazard of coal self-ignition was discussed; the essential characteristics of coal self-ignition were analyzed in term of non-linear theory.
笔者论述了煤炭自燃的危害，从非线性理论的角度分析了煤炭自燃的本质特征；
Coal self-ignition is a typical non-linear phenomenon.
煤炭自燃是一典型的非线性现象。
4-72 type centrifugal fan will pump air and other non-self-ignition of the human to the steel non-corrosive gases.
72型离心式通风机可输送空气和其他不自燃、对人体无伤害、对钢材无腐蚀性的气体。
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