短语词组短語coal -tar pitch derived carbon 煤瀝青炭blown coal -tar pitch 吹氣硬煤瀝青medium temperature coal -tar pitch 中溫煤瀝青Electrode coal -tar pitch binders 電極瀝青粘結劑blast furnace coal -tar pitch 高爐煤焦油瀝青 返回 coal tar pitch