Feasibility Study Regarding to the Possibilities of Processing a Part of Raw Coal Directly by Froth-flotation in the Coal Preparation Plant是什么意思_Feasibility Study Regarding to the Possibilities of Processing a Part of Raw Coal Directly by Froth-flotation in the Coal Preparation Plant在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句