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avia.
开关型号
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67 phrases
in 20 subjects
Agriculture
1
Air defense
1
Automobiles
4
Aviation
3
Chemistry
1
Compressors
2
Construction
2
Electric machinery
2
Electronics
8
Exhibitions
1
General
2
Genetics
1
Hydroelectric power stations
3
Metallurgy
3
Oil / petroleum
1
Project management
1
Shipbuilding
1
Space
1
Technology
27
Telecommunications
2
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