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| 通道放 大 器: 21 phrases in 10 subjects |
| Advertising | 1 |
| Air defense | 3 |
| Aviation | 1 |
| Information technology | 3 |
| Mathematics | 2 |
| Oil / petroleum | 3 |
| Shipbuilding | 3 |
| Space | 1 |
| Technology | 3 |
| Telecommunications | 1 |
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