A.降低排煙溫度,提高爐子熱效率 B.提高輻射段熱負(fù)荷 C.防止原料在對(duì)流段結(jié)焦
A.旋塞閥 B.截止閥 C.閘閥
A.25Cr-35Ni B.20Cr-32Ni C.25Cr-20Ni D.25Cr-40Ni