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| 直 系制: 38 phrases in 15 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 9 |
| Economy | 1 |
| Electronics | 3 |
| General | 1 |
| Management | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Polygraphy | 1 |
| Refrigeration | 6 |
| Technology | 8 |
| Telecommunications | 1 |
| Wind Energy | 1 |
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