扇形炮孔组 放射状环形钻孔

ringholes  detail>>

扇形炮孔组

fan holes fan round fan-pattren holes fan-shaped round ring holes ring-fann...  detail>>

扇形炮孔

fanhole(s)  detail>>

扇形炮孔爆破

ring blasting  detail>>

扇形炮孔间距

fan burden  detail>>

炮孔组爆破

round throw  detail>>

失效炮孔组

lost round  detail>>

全断面炮孔组

full face round  detail>>

扇形炮眼组

fan pattern holes fan shaped round  detail>>

放射状

circular cross sections radial pattern radialpattern  detail>>

环孔锥 环形钻 环形钻头

annularbit  detail>>

倒锤形钻孔

reverse taper ream  detail>>

倒锥形钻孔

reverse taper ream  detail>>

斗形钻孔

funned-shaped borehole funnel shaped borehole  detail>>

辐射状钻孔

radial drilling  detail>>

环形钻进

ring drilling  detail>>

环形钻头

annular bit annulated bit  detail>>

扇形炮眼排列方式

ring pattern  detail>>