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| 安全间距 | |||
| 安全距离 | |||
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safe distance : 30 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 3 |
| Chemistry | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 1 |
| Rail transport | 1 |
| Space | 4 |
| Technology | 15 |
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