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system frequency
avia. 系统频率
compr. 电网频率
system frequency: 207 phrases in 21 subjects
Agriculture2
Air defense20
Aviation24
Business1
Communications2
Earth sciences4
Electronics42
Geophysics4
Information technology8
Mathematics2
Metallurgy1
Navigation1
Nuclear and fusion power1
Oil / petroleum3
Radio1
Rail transport4
Reliability1
Shipbuilding11
Space26
Technology43
Telecommunications6

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