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| 调幅-调相 | |||
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amplitude modulation- phase modulation : 41 phrases in 13 subjects |
| Air defense | 1 |
| Automobiles | 2 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 18 |
| General | 1 |
| Geophysics | 3 |
| Information technology | 1 |
| Multimedia | 1 |
| Oil / petroleum | 1 |
| Space | 4 |
| Technology | 2 |
| Telecommunications | 4 |