单项选择题
A.减少炉体各种热损失 B.减少煤气带走的显热 C.减少铁水带出显热 D.减少渣量及其带出显热
A.1200℃ B.1250℃ C.1300℃ D.1350℃
A.2% B.1.8% C.1.2% D.0.8%
A.48%~51% B.60% C.70% D.80%
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