A.落地式全遮蓋防護(hù)隔離柵 B.開(kāi)敞式防護(hù)隔離柵 C.懸掛式防護(hù)隔離柵 D.任意防護(hù)隔離柵
A.防凍 B.防雨 C.防傾斜 D.避雷
A.5m B.10m C.15m D.20m