The spinning of coal tar pitch raw material is key procedure of shaping in manufacturing carbon fiber.
煤沥青原料的纺丝，是碳纤维制造过程中加工成型的关键步骤。
2
Recent trends in raw materials, in processing of crude coal tar to binder pitches and in new transportation systems are outlined.
概述了在原料、煤焦油到粘结剂沥青的加工及新的运输系统等方面的最新发展趋势。
3
Effect of urea malic acid on the content of tar in smoke smog and the quality of raw tobacco leaf was studied by gas spectrum and common analysis methods.