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| Probenabschnitt m (Schumacher) | |||
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проба материала : 12 phrases in 7 subjects |
| Chemistry | 1 |
| Geology | 3 |
| Oil / petroleum | 1 |
| Pulp and paper industry | 1 |
| Silicate industry | 3 |
| Technology | 2 |
| Water supply | 1 |
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