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primary-circuit : 73 phrases in 23 subjects |
| Astronautics | 2 |
| Automobiles | 1 |
| Caspian | 1 |
| Cement | 3 |
| Construction | 2 |
| Electrical engineering | 5 |
| Electronics | 4 |
| Energy industry | 9 |
| Firefighting and fire-control systems | 1 |
| General | 3 |
| Makarov | 4 |
| Mass media | 2 |
| Military | 1 |
| Natural resourses and wildlife conservation | 1 |
| Nautical | 1 |
| Non-destructive testing | 2 |
| Nuclear and fusion power | 18 |
| Nuclear physics | 2 |
| Pumps | 1 |
| Space | 1 |
| Technology | 6 |
| Thermal engineering | 1 |
| Transport | 2 |