The byproduct of petroleum industry - hard pitch andphysical and chemical properties are introduced.
介绍了一种在石油加工过程中产生的特殊副产物 - 硬沥青.
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The byproduct of petroleum industry - hard pitch is recommended and the physical and chemical properties are introduced.
摘要介绍了一种在石油加工过程中产生的特殊副产物 - 硬沥青.
互联网