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分析 数 值 : 29 phrases in 13 subjects |
| Aviation | 2 |
| Bridge construction | 1 |
| Commerce | 1 |
| Earth sciences | 8 |
| Economy | 1 |
| Electronics | 6 |
| General | 2 |
| Hydroelectric power stations | 1 |
| Marketing | 1 |
| Mathematics | 1 |
| Mechanics | 1 |
| Technology | 3 |
| Telecommunications | 1 |
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