变孔距多孔同段爆破
variable distance multi-hole simultaneous blasting
不等孔距
different distance of hole
抽采孔孔距
distance of the gas drainage
大孔距
Wide-spacing
blasting of large spacing and small burden
Wide hole spacing
Big space of hole
等孔径等孔距布孔
same aperture and distance hole-collocating
宽孔距布孔
wide-space disposal bore hole
宽孔距小抵抗线微差挤压爆破
Wide-space small burden millisecond Compression blasting
有效瞳孔距
effective interpupillary width
预裂孔距
Spacing of presplitting holes