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微分谱 : 48 phrases in 12 subjects |
| Animal husbandry | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Earth sciences | 5 |
| Electronics | 15 |
| Geology | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 4 |
| Oil processing plants | 1 |
| Plastics | 1 |
| Space | 4 |
| Technology | 11 |
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