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sello n |
封 : 44 phrases in 12 subjects |
Accumulators | 1 |
Cables and cable production | 1 |
Electric machinery | 3 |
Electric motors | 2 |
Electricity generation | 1 |
General | 21 |
Isolation | 2 |
Microsoft | 2 |
Nuclear physics | 2 |
Radiology | 2 |
Transformers | 6 |
Vacuum tubes | 1 |