Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
석탄건류는 석탄을 고온에서 가열하여 탄소를 추출하는 과정입니다.seoktan-geonryuneun seoktan-eul goonhwaneseo gaeyalhayeo tanso-reul chujulhaneun gwajeong-imnida.Carbonization is the process of heating coal at high temperatures to extract carbon.