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| primary circuit | |||
| primary system (первый Boris54) | |||
| primary tuned circuit | |||
| core circuit (охладителя) | |||
| первичный контур: 27 phrases in 11 subjects |
| Caspian | 1 |
| Construction | 4 |
| Electrical engineering | 2 |
| Electronics | 2 |
| Energy industry | 1 |
| Makarov | 5 |
| Natural resourses and wildlife conservation | 1 |
| Scientific | 1 |
| Shipbuilding | 4 |
| Technology | 5 |
| Thermal engineering | 1 |