1)direction of extraction,开采方向2)reverse direction mining,反向开采3)taking up,向上开采4)unidirectional working,单向开采5)working from bottom up,上向开采6)working to the dip,下向开采
用法和例句
Researches have been conducted in regard to the Stubble Repeating relationship at the Fifth and Sixth Seam at the Ping Dingshan Fifth and Sixth Coal Mine and the coal Pressure appear rule during the face mining,and the reverse direction mining method has been set down.