 |
| |||
| high-frequency communication (HF communication); high-frequency communications (HF communications); HF communication (high-frequency communication); HF communications (high-frequency communications) | |||
| связь КВ: 4 phrases in 4 subjects |
| Aviation | 1 |
| Electrical engineering | 1 |
| Energy system | 1 |
| Telecommunications | 1 |