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在线翻译_英语_读音_用法_例句