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【单选题】
避雷针引下线宜采用热浸锌圆钢或扁钢，宜优先采用圆钢。圆钢直径不应小于8mm。扁钢截面不应小于48mm 2 ，其厚度不应小于4mm。避雷针高度超过30m以上者，扁钢截面不小于（）mm 2 。A.
95
B.
120
C.
150
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