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| 高炉炉料停留时间; 高炉冶炼周期 (【技】高炉炼铁过程中炉料在高炉内的停留时间，是表征高炉下料速度的指标。) | |||
| residence time in blast furnace: 2 phrases in 1 subject |
| Metallurgy | 2 |
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