Spontaneous combustion of coal constitutes a very serious problem in North China.

中国北方煤田煤层自燃现象非常严重.

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The spontaneous combustion of coal seam endangers the safe production.

井下煤层自燃严重危害着安全生产.

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On a global scale, there are many coalfields suffered from spontaneous combustion of coal seam problems.

在全球范围内, 许多煤田都存在煤层自燃问题.

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The spontaneous combustion of coal seam of the major problems in safe production of coal mine.

煤层自燃问题一直困扰着我国煤矿的安全生产.

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In Zhunnan Jurassic coal - field, the spontaneous combustion of coal very serious, and there are long history.

准南煤田侏罗系煤层自燃严重, 火烧历史悠久.

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Three - phase foam as a new technology was proposed to prevent the spontaneous combustion of coal.

提出了三相泡沫防治煤炭自燃的新技术.

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