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刚度数 : 42 phrases in 13 subjects |
| Automobiles | 4 |
| Aviation | 1 |
| Bridge construction | 1 |
| Chemistry | 1 |
| Compressors | 1 |
| Ecology | 1 |
| Engineering geology | 2 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 3 |
| Space | 1 |
| Technology | 22 |
| Wind Energy | 3 |
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