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| 底部结构 | |||
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bottom structure : 12 phrases in 8 subjects |
| Electric machinery | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Information technology | 1 |
| Nautical | 2 |
| Nuclear and fusion power | 1 |
| Rail transport | 3 |
| Technology | 1 |
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