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| 【连】 变钢种操作 (In the grade change operation, the tundish containing the old grade of steel being cast is first emptied to a certain depth before pouring the new grade from the ladle. 变钢种操作时，在由钢包浇人下一炉异钢种钢水前，首先将盛有上一炉正在浇注钢种钢水的中间包排空到一定深度。) | |||
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grade change operation : 3 phrases in 1 subject |
| Metallurgy | 3 |
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