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| 波形炉胆 | |||
| 波形燃烧管锅炉的 | |||
| 锅炉的波形燃烧管 | |||
| 波形炉膛; 波型炉胆 | |||
| 波形燃烧管; 波纹火管 | |||
| corrugated furnace: 3 phrases in 2 subjects |
| Oil / petroleum | 1 |
| Technology | 2 |
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