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加 套管 : 31 phrases in 12 subjects |
| Automobiles | 2 |
| Aviation | 3 |
| Drilling | 2 |
| Electronics | 1 |
| General | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 7 |
| Rail transport | 1 |
| Refrigeration | 1 |
| Shooting sport | 1 |
| Space | 1 |
| Technology | 8 |
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