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平台安装 : 15 phrases in 10 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Bridge construction | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 5 |
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