vitrain

In vitrain bands the density and fractal dimension of fractures related to the thickness and lithotyp...

岩结构的研究在预测层的渗透性方面有重要意义。

The paper had a coal water mixture test with vitrain coal, bright coal and dull coal from Ningtiaota coal in Shenfu mining area.

选择神府矿区柠条塔中的、亮暗进行了制水浆试验。