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| multideck oven; multiple-story furnace | |||
| multistage grate | |||
| multihearth; multiple deck oven; multiple story furnace; multiple storey furnace | |||
| 多层炉: 12 phrases in 3 subjects |
| Ecology | 1 |
| Metallurgy | 5 |
| Technology | 6 |
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