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minimum frequency
adv. 广告最低刊播频次
econ. 最小频率
interntl.trade. 最低频率
minimum frequency
: 25 phrases in 15 subjects
Air defense2
Aviation2
Communications1
Earth sciences1
Electronics3
Explosives and Explosive Ordnance Disposal1
General1
Geophysics1
Information technology2
Oil / petroleum1
Piezoelectric crystals1
Rail transport1
Space1
Technology6
Telecommunications1