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| 夫气质量标准 | |||
| 空气质量标准 | |||
| 大气质量标准 | |||
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| 空气质量标准 | |||
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air quality standard : 18 phrases in 10 subjects |
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| Earth sciences | 1 |
| Ecology | 4 |
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| Metallurgy | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 4 |
| Wind Energy | 2 |
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