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| Delta modulation | |||
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增 量调制，δ 调制 : 55 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 4 |
| Business | 1 |
| Cartography | 1 |
| Communications | 1 |
| Electronics | 21 |
| Geophysics | 3 |
| Information technology | 6 |
| Shipbuilding | 2 |
| Space | 4 |
| Technology | 6 |
| Telecommunications | 5 |
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