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四牙轮钻头
dril.
cross cutters
;
cross roller bit
;
cross roller rock bit
;
cross section cone bit
;
cross section cutter
;
four-roller bit
eng.geol.
four-cutter bit
oil
cross-section cone bit
;
four-cone bit
tech.
four cutter bit
四牙轮钻头:
3 phrases
in 2 subjects
Drilling
1
Oil / petroleum
2
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