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variable frequency
geophys.	可变频率
tech.	变频

variable frequency: 119 phrases in 27 subjects

Agriculture	2
Air defense	10
Aviation	9
Bridge construction	1
Communications	1
Compressors	2
Construction	1
Earth sciences	2
Electric machinery	8
Electronics	23
General	3
Geophysics	5
Hydroelectric power stations	4
Information technology	1
Mechanics	3
Metallurgy	2
Multimedia	1
Nuclear and fusion power	1
Oil / petroleum	1
Radio	2
Rail transport	2
Refrigeration	1
Space	3
Statistics	1
Steel production	2
Technology	24
Wind Energy	4