【单选题】【消耗次数：1】
由于上方施工可能坠落物件或处于起重机把杆回转范围之内的通道，在其受影响的范围内，必须搭设( )。
①
单层防护棚
②
单层防护网
③
双层防护
④
顶部能防止穿透的双层防护棚
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【多选题】
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