 |
| |||
| 频率脉冲调制 | |||
|
frequency pulse modulation : 48 phrases in 13 subjects |
| Air defense | 7 |
| Automobiles | 1 |
| Aviation | 2 |
| Earth sciences | 4 |
| Electric machinery | 1 |
| Electronics | 17 |
| Geophysics | 1 |
| Information technology | 1 |
| Radio | 2 |
| Remote sensing | 1 |
| Space | 3 |
| Technology | 7 |
| Telecommunications | 1 |