“硬沥青”造句

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

• #硬沥青