高压户内穿墙套管
high tension indoor wall entrance bushing sleeve
户内、外大屏幕数字显示
indoor or outdoor display
户内采暖系统形式
residence heat supply system
户内单极隔离开关
indoor single-pole isolating switch
户内高压隔离开关
indoor high-voltage isolating switch
户内挂表
indoor installation gas meter
户内户外广告
indoor-outdoor advertising
户内配电变压器
indoor distribution transformer
户内燃气管
gas pipe in high-rise buileling