Petroleum coke, petroleum bitumen and other residues of petroleum oils or of oils obtained from bituminous minerals.
石油焦、石油沥青及其他石油或从沥青矿物提取的油类的残渣。
It is in keeping with the requirement of environmental protection and economic efficiency to produce impregnating pitch from petroleum bitumen modified.
认为石油沥青经过改性后制备浸渍剂沥青符合环保和经济性要求。
It is in keeping with the requirement of environmental protection and economic efficiency to produce impregnating pitch from petroleum bitumen modified.
认为石油沥青经过改性后制备浸渍剂沥青符合环保和经济性要求。
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