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| 国防通信系统美 | |||
| 美国国防部通讯系统海洋和大气管理局 | |||
| 国防通信系统 | |||
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defense communication system : 12 phrases in 5 subjects |
| Air defense | 1 |
| Earth sciences | 1 |
| General | 2 |
| Space | 6 |
| United States | 2 |
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