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| center split pipe; split duct | |||
| center split tube; centre split pipe; split pipe | |||
| 对开管: 18 phrases in 7 subjects |
| Drilling | 1 |
| Engineering geology | 3 |
| General | 1 |
| Oil / petroleum | 2 |
| Refrigeration | 1 |
| Technology | 9 |
| United Nations | 1 |
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