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[单选题]
按《镀锌钢绞线》规定,无特殊要求时,钢绞线的定尺长度不得小于()。
A.200m
B.1000m
C.500m
D.100m
查看答案
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A.200m
B.1000m
C.500m
D.100m
A、避雷针长1-2m时,圆钢直径为12mm,钢管直径20mm,
B、避雷带(网)用圆钢不小于8mm,扁钢截面不小于48mm2,厚度不小于4mm,
C、架空避雷线用截面不小于35mm2的镀锌钢绞线
D、钢管壁厚不小于2.5mm,但钢管、钢罐一旦被雷击穿,其介质对周围环境造成危险时,其壁厚不小于4mm。