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检验环
oil
test ring
tech.
proving ring
检验环
:
31 phrases
in 15 subjects
Animal husbandry
2
Automobiles
1
Business
1
Drilling
1
Ecology
1
Electronics
6
Geophysics
1
Information technology
1
Mathematics
2
Nautical
3
Oil / petroleum
2
Project management
1
Quality control and standards
1
Technology
7
Telecommunications
1
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