... perforation length 射孔段长度 perforation packing 炮眼充填 perforation pattern 炮眼排列分布 ...
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短语
第一步炮眼充填
first-stage perforation pack
炮眼充填材料的渗透率
permeability of tunnel fill material
预充填炮眼
prepack-perforation
炮眼预充填
perforation prepack
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perforation packing
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perforation packing
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