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钻粒钻进
eng.geol. drilling by pellets; shot boring
tech. calyx drilling; chilled shot drilling; shot drilling
钻粒钻进利用钻头拖动孔底钻粒破碎岩石的钻进
expl. shot drilling; shot holding
钻粒钻进: 13 phrases in 2 subjects
Engineering geology3
Technology10