A.0.24% B.10% C.1% D.1.24%
A.CO B.CH2 C.CO2 D.H2
A.發(fā)熱劑、還原劑 B.料柱骨架和滲碳劑 C.料柱骨架和還原劑 D.發(fā)熱劑、還原劑、滲碳劑