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sill floor; bottom level | |||
background level |
niveau de fond : 22 phrases in 10 subjects |
Communications | 1 |
Construction | 1 |
Earth sciences | 2 |
Electronics | 2 |
Environment | 1 |
Finances | 4 |
General | 2 |
Metallurgy | 4 |
Natural resourses and wildlife conservation | 1 |
Nuclear physics | 4 |