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| 区域波束 (通信卫星的一种波束) | |||
| 区域波束 | |||
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zone beam : 17 phrases in 7 subjects |
| Bridge construction | 1 |
| Electronics | 1 |
| General | 2 |
| Metallurgy | 7 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 3 |
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