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avia.	开关型号

switching type : 76 phrases in 23 subjects

Agriculture	1
Air defense	1
Automobiles	4
Aviation	3
Biotechnology	3
Chemistry	1
Communications	1
Compressors	2
Construction	2
Electric machinery	3
Electronics	8
Exhibitions	1
General	2
Genetics	2
Hydroelectric power stations	3
Information technology	1
Metallurgy	3
Oil / petroleum	2
Project management	1
Shipbuilding	1
Space	1
Technology	28
Telecommunications	2