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备用盘 : 13 phrases in 9 subjects |
| Aviation | 1 |
| Drilling | 1 |
| Electronics | 2 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Project management | 1 |
| Shipbuilding | 1 |
| Skydiving | 3 |
| Technology | 2 |
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