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frequency spectrum
tech.	频率谱
wind.	★ 频谱

frequency spectrum : 112 phrases in 25 subjects

Air defense	13
Artificial intelligence	1
Astronomy	1
Automobiles	1
Aviation	2
Business	2
Chemistry	3
China	1
Computer networks	1
Electric machinery	2
Electronics	11
Foreign trade	1
Information technology	5
Metallurgy	2
Nautical	2
Oil / petroleum	6
Otorhinolaryngology	2
Physics	1
Plastics	1
Rail transport	1
Shipbuilding	2
Space	7
Technology	35
Telecommunications	7
Wind Energy	2