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engineering problem
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tech.
技术问题
engineering problems
:
20 phrases
in 12 subjects
Aviation
2
Bridge construction
2
Desert science
1
Earth sciences
1
Ecology
1
Explosives and Explosive Ordnance Disposal
1
General
2
Geophysics
1
Hydroelectric power stations
3
Oil / petroleum
1
Scientific
1
Technology
4
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