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| схема защиты | |||
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safe circuit : 21 phrases in 11 subjects |
| Electricity | 3 |
| Electronics | 3 |
| Firefighting and fire-control systems | 1 |
| General | 2 |
| Makarov | 1 |
| Mining | 2 |
| Quality control and standards | 1 |
| Security systems | 3 |
| Solar power | 2 |
| Technology | 2 |
| Telecommunications | 1 |