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downhole drill
dril.
井下
震击
钻具
earth.sc.
潜孔锤〔钻机〕
eng.geol.
潜孔钻机
tech.
潜孔凿岩机
;
下向凿岩机
;
入孔冲击钻机
;
潜孔钻
downhole drill:
9 phrases
in 2 subjects
Engineering geology
3
Technology
6
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