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拨 开 关 : 20 phrases in 13 subjects |
| Agriculture | 1 |
| Architecture | 1 |
| Aviation | 1 |
| Data processing | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Lighting other than cinema | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Project management | 1 |
| Technology | 7 |
| Telecommunications | 2 |
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