A.扁鋼截面不應(yīng)小于100 mm2 B.扁鋼截面不應(yīng)小于120 mm2 C.厚度為6mm D.厚度為4mm
A.當(dāng)采用圓鋼時(shí),直徑不應(yīng)小于10mm B.當(dāng)采用圓鋼時(shí),直徑不應(yīng)小于6mm C.當(dāng)采用扁鋼時(shí),厚度不應(yīng)小于4mm D.當(dāng)采用扁鋼時(shí),厚度不應(yīng)小于3.5mm
A.避雷針的直徑 B.避雷針的長(zhǎng)度 C.避雷針安裝的位置 D.避雷針安裝的高度