空心块石层
hollow concrete brick layer
空心村改造
hollow village reconstruction
220kV空心瓷绝缘子
220kV porcelain hollow insulator body
35kV干式空心电抗器
35kV dry-type air-core reactor
FRP-混凝土-钢双壁空心管
FRP-concrete-steel double-skin tube
FRP-混凝土-钢双壁空心管短柱
FRP-concrete-steel double-skin tubular stub