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防护法 : 15 phrases in 9 subjects |
| Automobiles | 1 |
| Business | 1 |
| Environment | 1 |
| Management | 1 |
| Metallurgy | 2 |
| Refrigeration | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 6 |
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