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管截面 : 62 phrases in 13 subjects |
| Architecture | 2 |
| Automobiles | 2 |
| Aviation | 4 |
| Bridge construction | 1 |
| Construction | 2 |
| Electronics | 5 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 4 |
| Refrigeration | 1 |
| Space | 7 |
| Technology | 30 |
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