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中空孔在平行空孔直线掏槽中,中空掏槽中不装药的炮孔,也叫导向孔。中空孔和装药炮孔之间的距离,取决于炮孔的直径和岩石性质,参见 burn hole
expl. pilot hole
中空孔在平行空孔直线掏槽中,中空掏槽中不装药的炮孔,也叫导向孔。中空孔和装药炮孔之间的距离,取决于炮孔的直径和岩石性质。参见 pilot; hole
expl. burn hole
中空孔
: 14 phrases in 5 subjects
Explosives and Explosive Ordnance Disposal5
Polymers1
Technology2
Textile industry5
Water resources1