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two cone bit
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mech.
IADC 钻头分类代码
两牙轮钻头
two-cone bit
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oil
双牙轮钻头
tech.
二牙轮钻头
;
双锥牙轮钻头
two cone bit
:
4 phrases
in 3 subjects
Drilling
1
Mechanics
2
Oil / petroleum
1
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