A.煤气 B.矿石 C.焦炭 D.炉墙壁
A.90% B.93% C.96% D.99.8%
A.氧气 B.氮气 C.氩气 D.空气
A.碳含量 B.屈服强度值 C.磷硫含量 D.冲击强度值
A.全铝 B.酸溶铝 C.酸不溶铝 D.水溶铝