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