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| 定期维护 | |||
| schedule maintenance: 23 phrases in 8 subjects |
| Aviation | 7 |
| Compressors | 1 |
| Electric machinery | 1 |
| Information technology | 1 |
| Metallurgy | 7 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 4 |
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