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安装管道 : 51 phrases in 12 subjects |
| Agriculture | 2 |
| Chemistry | 3 |
| Earth sciences | 1 |
| General | 2 |
| Hydroelectric power stations | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Refrigeration | 2 |
| Shipbuilding | 1 |
| Technology | 32 |
| Telecommunications | 1 |
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