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链条机 : 30 phrases in 9 subjects |
| Architecture | 1 |
| Automobiles | 2 |
| Engineering geology | 1 |
| General | 3 |
| Metallurgy | 4 |
| Oil / petroleum | 2 |
| Steel production | 1 |
| Technology | 14 |
| Textile industry | 2 |
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