A.60% B.70% C.75% D.80%
A.1.0~1.1 B.1.2~1.3 C.1.5~3.5 D.>3.5
A.礦石的還原與熔化 B.爐料與煤氣的運(yùn)動 C.風(fēng)口前焦炭的燃燒