This paper discussed the raw coal selection method for a low ash coal preparation and the separa-tion technology of a low ash coal with the columned pneumatic floatation machine.是什么意思_This paper discussed the raw coal selection method for a low ash coal preparation and the separa-tion technology of a low ash coal with the columned pneumatic floatation machine.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句