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工作顺序 : 10 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Business | 1 |
| Economy | 1 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 2 |
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