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dril.
扣状钻头
;
球齿钻头
eng.geol.
全面
冲击钻头
expl.
钨钻头
含有碳化钨铅粒的冲击钻头
tech.
球齿形钎头
;
碳化钨钻头
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:
4 phrases
in 2 subjects
Oil / petroleum
3
Technology
1
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