- return-tube boiler
- 回: circle; wind
- 行: go
- 火管锅炉: fire tube boiler
- 火管锅炉: dire tube boiler; fire tube boilerr; fire tube steam boiler; fire-tube boiler; gastube boiler; multitubular boiler,tubular boiler; scotch boiler; shell boiler; smoke tube boiler; smoke tube cylindrical boiler; smoked tube type boiler; smoketubeboiler; tank boiler; tubular boiler
- 内火管锅炉: i ide fire-tube boiler; inside fire-tube boiler
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