与"Coal-mining engineer"相近的词条

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• coal-mine irainage
• coal mine safety regulation
• coal miner
• coal-miner's lung、Coal miners' lung
• coal miner's pneumoconiosis、Coal miners' pneumoconiosis
• Coal-mining engineer
• coal oil
• coal oil mixture
• Coal pneumoconiosis
• Coal product
• coal pyrile
• coal seam
• coal slag
• coal smoke
• coal smoke pollution
• coal stone

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