黑[硬,天然]沥青;硬沥青;
For example, aggregate gradation named as Sup-13 mixture to which natural gilsonite asphalt is added is design.
如掺天然岩沥青的Sup-13沥青混合料的级配设计。
The article introduced the category of natural bitumen and the characteristic of gilsonite.
介绍了天然沥青的种类与天然岩沥青的特点.
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