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信号频率 xìnhào pínlǜ
geophys. signal frequency
信 号 频率: 73 phrases in 16 subjects
Air defense9
Aviation4
Communications1
Computer networks1
Earth sciences1
Electronics11
General1
Metallurgy1
Oil / petroleum2
Project management2
Radio1
Rail transport2
Shipbuilding1
Space7
Technology26
Telecommunications3