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frequency constant
piez. 频率常数
tech. 频率常量
frequency constant
: 61 phrases in 16 subjects
Air defense3
Aviation11
Business1
Earth sciences2
Electric machinery2
Electronics12
General5
Geophysics4
Metallurgy2
Oil / petroleum1
Otorhinolaryngology1
Radio1
Space3
Technology8
Telecommunications2
Wind Energy3