单项选择题
A.0.1％～0.7％B.0.2％～0.8％C.0.3％～0.9％
A.自供热转炉炼钢B.空气转炉炼钢C.顶底复吹转炉炼钢
A.顶吹转炉炼钢B.酸性转炉炼钢C.氧气转炉炼钢
A.氧气转炉炼钢B.顶吹转炉炼钢C.碱性转炉炼钢
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