单项选择题
A.石灰石B.石灰C.锰铁D.炭粉
A.1~2B.2~2.5C.2.5~3D.3~3.5
A.脱碳B.脱锰C.去气D.脱磷
A.1720B.1620C.1520D.1420
A.40%B.50%C.60%D.70%
A.0.1%B.0.2%C.0.3%D.0.4%
A.0.5%~1.0%B.1.0%~1.5%C.1.5%~2.0%D.2.0%~2.5%
A.氧化期B.还原期C.出钢前10minD.装料时
A.氧化期B.还原期C.出钢前D.装料时
A.加料B.捣料C.造渣D.升温
A.10~40B.40~80C.80~120D.120~160