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| external treatment | |||
| out-boiler treatment | |||
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外 部处理 : 16 phrases in 7 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Electronics | 7 |
| Information technology | 1 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 3 |
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