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air standard
avia. 大气标准
air standards
auto. 空气净化标准; 大气标准
air standard: 79 phrases in 20 subjects
Air defense1
Automobiles6
Aviation11
Business1
Compressors1
Desert science1
Earth sciences3
Ecology7
Electronics1
Environment4
General3
Hydroelectric power stations1
Metallurgy2
Nursing1
Oil / petroleum1
Oil processing plants1
Refrigeration4
Space3
Technology22
Wind Energy5