GB/T 17650.2-1998 取自电缆或光缆的材料燃烧时释出气体的试验方法 第2部分:用测量pH值和电导率来测定气体的酸度,IEC 60754-2:1991 Test on gases evolved during combustion of electric cables Part 2: Determination of degree of acidity of gases evolved during the combustion of materials taken from electric cables by measuring pH and conductivity