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| theoretical density | |||
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全 密度 : 15 phrases in 8 subjects |
| Animal husbandry | 1 |
| Aviation | 1 |
| Business | 1 |
| Chemistry | 2 |
| Cryptography | 1 |
| Geophysics | 6 |
| Polymers | 1 |
| Technology | 2 |
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