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Terms for subject Explosives and Explosive Ordnance Disposal containing drill collar | all forms
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It is discovered in filed experiments that most of the collar flyrock is thrown in a direction fallowing the drill holding axis现场实验发现、孔口周围的大部分飞石沿着炮孔轴线方向抛掷出去
It is discovered in filed experiments that most of the collar flyrock is thrown in a direction fallowing the drill hole axis现场实验发现、孔口周围的大部分飞石沿着炮孔轴线方向抛掷出去