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选择 开 关 : 102 phrases in 18 subjects |
| Air defense | 1 |
| Automobiles | 19 |
| Aviation | 13 |
| Business | 1 |
| Compressors | 1 |
| Computer numerical control | 1 |
| Construction | 1 |
| Dermatology | 2 |
| Electronics | 10 |
| Geophysics | 3 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Project management | 2 |
| Shipbuilding | 4 |
| Space | 8 |
| Technology | 30 |
| Telecommunications | 3 |
| Wind Energy | 1 |
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