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需用 率 : 13 phrases in 10 subjects |
| Aviation | 1 |
| Computer numerical control | 1 |
| Construction | 1 |
| Electronics | 2 |
| General | 1 |
| Metallurgy | 1 |
| Rail transport | 1 |
| Technology | 3 |
| Telecommunications | 1 |
| Wind Energy | 1 |
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