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井下钻具
dril.
subequipment
oil
down-hole equipment
;
down-the hole
DTH
drill
tech.
downhole equipment
井下
震击
钻具
dril.
downhole drill
井下钻具:
28 phrases
in 5 subjects
Drilling
8
Earth sciences
2
General
1
Oil / petroleum
16
Technology
1
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