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井下作业
jǐngxià zuòyè
bridg.constr.
operation in the pit
China, law
work in underground coal mines
oil
borehole operation
;
downhole servicing operation
tech.
underground works
;
workover and downhole operation
井下作业:
12 phrases
in 4 subjects
China
1
Drilling
1
Oil / petroleum
5
Technology
5
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