空心拉力螺钉张力带钢丝
cannulated lag screws with a tension band
Figure-eight wiring through two parallel annulated compression screws
空心拉力螺丝钉
cannulated cancellors bone screws and tension hand
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