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| 定向精合器; 方向性锅合器 | |||
| 定向分支器 | |||
| 定向方向耦合器 | |||
| 定向耦合器 | |||
| directional coupler: 50 phrases in 6 subjects |
| Air defense | 9 |
| Electronics | 20 |
| Information technology | 1 |
| Shipbuilding | 3 |
| Technology | 14 |
| Telecommunications | 3 |
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