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| 气体管线 | |||
| 燃气管道; 煤气管道; 煤气导管; 煤气管线; 气管线; 气体管路 | |||
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gas pipe line : 11 phrases in 7 subjects |
| Architecture | 1 |
| China | 1 |
| Company name | 2 |
| General | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 4 |
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