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frequency test
avia. 频数检验
frequency test: 61 phrases in 18 subjects
Animal husbandry1
Aviation7
Business1
Compressors1
Electric machinery4
Electric motors1
Electronics14
Explosives and Explosive Ordnance Disposal1
Geophysics2
Hydroelectric power stations1
Information technology1
Metallurgy3
Shipbuilding1
Space6
Sports1
Technology14
Water resources1
Wind Energy1

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