A.VN2=0.005rnol/(L¡¤s) B.VH2=0.015rnol/(L¡¤s) C.VNH3=0.01rnol/(L¡¤s) D.VNH3=0.02rnol/(L¡¤s)
A.爐管不發(fā)生超溫 B.爐管不發(fā)生超壓 C.保證爐膛溫度下降平穩(wěn) D.爐膛溫度均勻
A.發(fā)生氫腐蝕 B.焊接技術缺陷 C.發(fā)生金屬疲勞 D.材質缺陷