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| 油管道 | |||
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| 润滑油管系; 油管道 | |||
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oil-piping : 28 phrases in 9 subjects |
| Automobiles | 1 |
| Compressors | 1 |
| Electronics | 9 |
| Hydroelectric power stations | 2 |
| Metallurgy | 4 |
| Nautical | 2 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Technology | 6 |
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