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水封水管 : 40 phrases in 9 subjects |
| Architecture | 1 |
| Aviation | 2 |
| Drilling | 9 |
| Electric machinery | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 5 |
| Mining | 1 |
| Oil / petroleum | 3 |
| Technology | 17 |
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