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容重比 : 21 phrases in 12 subjects |
| Aviation | 1 |
| Business | 1 |
| Chemistry | 1 |
| Construction | 1 |
| Desert science | 1 |
| Economy | 1 |
| Electric machinery | 2 |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 1 |
| Plastics | 1 |
| Technology | 9 |
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