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双掷 开 关 : 20 phrases in 12 subjects |
Earth sciences | 1 |
Electronics | 2 |
General | 2 |
Geophysics | 3 |
Hydroelectric power stations | 1 |
Information technology | 4 |
Navigation | 1 |
Nuclear and fusion power | 1 |
Project management | 1 |
Rail transport | 1 |
Space | 2 |
Technology | 1 |