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| 国防通信卫星计划 (美国) | |||
| 国防通信卫星计划 | |||
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| 国防通信卫星计划 | |||
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defense communications satellite program : 12 phrases in 5 subjects |
| Aviation | 1 |
| Electronics | 3 |
| Space | 4 |
| United Kingdom | 1 |
| United States | 3 |
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