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to phrases
bumper sub
dril.
震击器
;
伸缩节
oil
缓冲节
;
震动器
tech.
钻探船钻杆滑动接头
;
打头
(撞击被卡钻具用)
;
伸缩钻杆
bumper sub
:
9 phrases
in 2 subjects
Drilling
2
Oil / petroleum
7
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