By a lot of experiment, the author claimed a soft arc striking technic which lead the arc ignition success rate to as high as above 90%.
作者还通过大量的试验，以软起动引弧方式，使焊机的引弧成功率达90%以上。
It is the active groups that lead to self ignition of coal.
“活性基团”是导致煤自燃的主要因素。
More cavities lead to better ignition ability.
燃料着火能力随凹腔数目的增多而增强。
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