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保护性金属 : 25 phrases in 10 subjects |
| Automobiles | 1 |
| Chemistry | 1 |
| Compressors | 2 |
| Electronics | 2 |
| General | 1 |
| Metallurgy | 5 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 9 |
| Wind Energy | 1 |
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