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谱级
tech.
spectrum level
光
谱级
met.
order of spectrum
谱级:
129 phrases
in 22 subjects
Acoustics
1
Advertising
1
Agriculture
1
Animal husbandry
1
Aviation
1
Chemistry
6
Desert science
1
Earth sciences
8
Electronics
32
General
1
Geology
7
Hydroelectric power stations
2
Information technology
1
Metallurgy
5
Nautical
1
Oil / petroleum
4
Oil processing plants
1
Polymers
5
Shipbuilding
1
Space
4
Technology
44
United States
1
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