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管 道设备 : 20 phrases in 9 subjects |
| Animal husbandry | 1 |
| Aviation | 1 |
| Biotechnology | 1 |
| Electric machinery | 1 |
| Electronics | 2 |
| General | 1 |
| Nautical | 1 |
| Technology | 11 |
| United Nations | 1 |
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