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| range observation | |||
| range spotting | |||
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距离观测 : 18 phrases in 7 subjects |
| Air defense | 1 |
| Australian | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Space | 4 |
| Technology | 8 |
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