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电炉或冲天炉在熔炼过程中,需要加入硅铁等铁合金,使用时都要事先知道其中元素的含量。在有条件的单位可以经过化验测定,但在不具备这
Electric furnace or cupola smelting process, you need to join ferrosilicon and other ferroalloy, the use of which have to know in advance which elemental content. In the conditional units can be tested, but do not have this