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frequency standard
geophys.	频率标准
space	频标

frequency standard: 90 phrases in 18 subjects

Agriculture	1
Air defense	6
Aviation	2
Bridge construction	1
Business	1
Communications	1
Earth sciences	2
Electronics	10
General	1
Geophysics	4
Hydroelectric power stations	1
Information technology	4
Oil / petroleum	4
Radio	1
Space	17
Technology	27
Telecommunications	6
United States	1