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position fixing navigation system |
定位导航 系统 : 48 phrases in 14 subjects |
Air defense | 2 |
Automobiles | 2 |
Aviation | 10 |
Cartography | 1 |
Communications | 2 |
Earth sciences | 4 |
Electronics | 5 |
Information technology | 1 |
Nautical | 3 |
Navigation | 1 |
Oil / petroleum | 1 |
Space | 8 |
Technology | 5 |
United States | 3 |