cable penetration unit 电缆贯穿件

power and control cable penetration 电力及控制电缆贯穿件

piping and cable penetration 管道和电缆贯穿件

prestressed-glass cable penetration 预应力玻璃电缆贯穿件

cable penetration piece 电缆管通件

cable penetration fittings [电] 电缆贯通件

retaining frontwall for cable penetration [电] 电缆贯穿密封堵料

cable tray penetration 电缆槽盒穿透

penetration cable mainspring 进尺测量索恢复弹簧