Study on the Techniques for the Comprehensive Gas Control in the Comprehensive Mechanized Coal-mining Faces of Highly Gassy and Inflammable Coal Bed是什么意思_Study on the Techniques for the Comprehensive Gas Control in the Comprehensive Mechanized Coal-mining Faces of Highly Gassy and Inflammable Coal Bed在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句