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碳化钨钻头
oil
tungsten carbide bit
tech.
button bit
;
tungsten-carbide chisel
碳化钨
合金
钻头
tech.
tungsten-carbide bit
碳化钨钻头
:
15 phrases
in 4 subjects
Drilling
3
Mechanics
1
Oil / petroleum
5
Technology
6
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