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防护 型 : 36 phrases in 11 subjects |
| Architecture | 1 |
| Automobiles | 2 |
| Bridge construction | 2 |
| Cryptography | 1 |
| Ecology | 1 |
| Electric machinery | 12 |
| Electronics | 8 |
| Nautical | 2 |
| Polymers | 1 |
| Space | 1 |
| Technology | 5 |
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