独立烟囱顶上环形避雷带及引下线,当采用热镀锌圆钢或扁钢时,其截面规格符合要求的是()。
A.圆钢直径不小于8mm,扁钢截面不小于48mm2,厚度不小于4mm; B.圆钢直径不小于10mm,扁钢截面不小于80mm2’厚度不小于4mm; C.C圆钢直径不小于12mm,扁钢截面不小于100mm2,厚度不小于3mm; D.D圆钢直径不小于12mm,扁钢截面不小于1OOmm2,厚度不小于4mm。正确答案D
独立烟囱顶上环形避雷带及引下线,当采用热镀锌圆钢或扁钢时,其截面规格符合要求的是()。
A.圆钢直径不小于8mm,扁钢截面不小于48mm2,厚度不小于4mm; B.圆钢直径不小于10mm,扁钢截面不小于80mm2’厚度不小于4mm; C.C圆钢直径不小于12mm,扁钢截面不小于100mm2,厚度不小于3mm; D.D圆钢直径不小于12mm,扁钢截面不小于1OOmm2,厚度不小于4mm。正确答案D