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衬 套管 : 18 phrases in 9 subjects |
| Architecture | 1 |
| General | 1 |
| Mechanics | 1 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Refrigeration | 2 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 8 |
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