bitumenn.沥青;柏油
bitumen anticorrosive paint沥青防锈漆
bitumen damp-proof course沥青防潮层
bitumen concrete mad surface沥青混凝土路面
bitumen concrete road surface沥青混凝土路面
bitumen-sheathed paper cable沥青绝缘纸电缆
bitumen modification equipment改性沥青设备
bitumen road surface structure沥青路面结构
bitumen with different periods沥青期次