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| 管输天然气 | |||
| 管道煤气 | |||
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pipeline gas : 60 phrases in 15 subjects |
| Automobiles | 1 |
| Business | 1 |
| Chemistry | 1 |
| China | 1 |
| Company name | 6 |
| Ecology | 2 |
| Economy | 1 |
| Electronics | 2 |
| Environment | 2 |
| Logistics | 1 |
| Mass media | 1 |
| Metallurgy | 8 |
| Oil / petroleum | 18 |
| Rail transport | 1 |
| Technology | 14 |
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