coal mine gas是什么意思 coal mine gas怎么读
coal mine gas的用法和样例
- Research on the Principle and Methods of Danger Assessment of Continuous Danger Source and Their Application in Coal Mine Gas Disaster.
连续危险源危险性评价原理与方法及其在煤矿瓦斯灾害中的应用研究。 - The alleviation and prevention of the natural disaster caused by outbursts in coal mines are of great significance.
对减轻和防止煤矿瓦斯突出自然灾害具有重要意义。
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