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to phrases
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
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