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【多选题】
转炉脱氧过程中脱氧剂加入的原则是（）。
A.
以脱氧为目的元素先加，合金化元素后加
B.
合金化元素先加，以脱氧为目的元素后加
C.
易氧化的贵重合金应在脱氧良好的情况下加入
D.
难熔的、不易氧化的合金应加热后加在炉内
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D.
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