A heavy corrosion preventing petroleum pitch - polyurethane paint has been prepared.

制备了一种石油沥青聚氨酯厚浆型重防腐涂料.

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Co - carbonization with petroleum pitch is of some advantage on economy.

石油沥青共炭化在经济上具有一定的优势.

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A pitch mesophase can be prepared from petroleum pitch and coal tar pitch.

从石油沥青和煤沥青中制取沥青中间相物质.

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Introduced petroleum pitch, especially the utility of road bitumen and the significant position in national economy.

介绍了石油沥青, 非凡是道路沥青的用途及在国民经济中的重要地位.

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