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air quality criteria | |||
air quality standards | |||
air quality criterion | |||
air quality standard |
空气质量标 准 : 16 phrases in 10 subjects |
Business | 1 |
Earth sciences | 2 |
Ecology | 3 |
Environment | 1 |
Hydroelectric power stations | 1 |
Metallurgy | 1 |
Refrigeration | 1 |
Space | 1 |
Technology | 4 |
Wind Energy | 1 |