 |
| 振荡频率: 59 phrases in 16 subjects |
| Air defense | 2 |
| Automobiles | 2 |
| Aviation | 2 |
| Construction | 2 |
| Earth sciences | 1 |
| Electronics | 15 |
| General | 1 |
| Geophysics | 5 |
| Information technology | 1 |
| Multimedia | 1 |
| Nautical | 1 |
| Oil / petroleum | 2 |
| Shipbuilding | 1 |
| Space | 3 |
| Technology | 19 |
| Telecommunications | 1 |