Selecting Incline Length of Coal Face Reasonably under Special Conditions to Prevent Gas Passing the Limit Concentration and Coal Seam Spontaneous Combustion是什么意思_Selecting Incline Length of Coal Face Reasonably under Special Conditions to Prevent Gas Passing the Limit Concentration and Coal Seam Spontaneous Combustion在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句