【单选题】【消耗次数：1】
施工现场必须按规定设置连续、封闭的围挡。在市区主要路段和市容景观道路及机场、码头、车站广场的工地设置的围挡，其高度不得低于（ ）m。
①
1.5
②
1.8
③
2
④
2.5
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