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| 防护因数【核】; 防护因子 | |||
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protection factors : 6 phrases in 6 subjects |
| Air defense | 1 |
| Desert science | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Space | 1 |
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