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to phrases
上下活动钻具
shàngxià huódòng zuànjù
dril.
chase pipe
;
picp-up & slack off
;
reciprocate string
oil
jostle
;
spudding up and down
tech.
work the pipe up and down
上下活 动 钻具
:
2 phrases
in 2 subjects
Drilling
1
Technology
1
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