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| floating scum (на поверхности сточной жидкости в очистных сооружениях); scum; scum (на поверхности сточной жидкости в очистных сооружениях) | |||
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пена и плавающие вещества : 3 phrases in 3 subjects |
| Ecology | 1 |
| Technology | 1 |
| Water supply | 1 |
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