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| conduit coupling | |||
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| sewer connection | |||
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管道连接 : 35 phrases in 10 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| General | 1 |
| Hydrology | 1 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Refrigeration | 1 |
| Shipbuilding | 2 |
| Technology | 24 |
| Telecommunications | 1 |
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