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frequency limit
auto.	振动频率极限范围
earth.sc.	频率极限
refrig.	频率限制
tech.	频率界限

frequency limit : 25 phrases in 12 subjects

Aviation	1
Business	2
Economics	1
Electronics	4
Explosives and Explosive Ordnance Disposal	1
Geophysics	1
Hydroelectric power stations	1
Information technology	2
Metallurgy	1
Space	2
Technology	8
Telecommunications	1