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地面系统 | |||
地面系统陆地通信系统,不包括卫星,海缆等系统 |
terrestrial system : 30 phrases in 12 subjects |
Air defense | 1 |
Aviation | 3 |
Communications | 1 |
Desert science | 1 |
Earth sciences | 3 |
Electronics | 6 |
Hydrology | 1 |
Name of organization | 1 |
Space | 5 |
Technology | 4 |
Telecommunications | 2 |
United Nations | 2 |