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| 压缩空气管道; 压缩空气管线 | |||
| 压缩空气管系; 压缩空气管道 | |||
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| 压缩空气管道 | |||
| compressed-air piping: 4 phrases in 3 subjects |
| Hydroelectric power stations | 1 |
| Shipbuilding | 2 |
| Technology | 1 |
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