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螺旋掏槽直线掏槽的一种形式。掏槽炮孔布置呈螺旋状，它们围绕一个中心孔依爆破顺序先后逐步加大孔距。采用毫秒延时爆破将自由面螺旋形扩大。常用的螺旋掏槽有两种形式，即单螺旋和双螺旋
expl. spiral cut
螺旋掏槽
tech. spiral cut
螺旋掏 槽
: 3 phrases in 2 subjects
Explosives and Explosive Ordnance Disposal2
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