You can choose the rings, hook type, derrick installation.
可以选择吊环式，挂钩式，吊杆式安装方式。
Derrick-type reinforced concrete beam often appears in the framework of house walls and building walls that don't support the weight of walls, boards and so on.
王艳丽，张云龙，费以原钢筋混凝土井式梁在屋面和非承墙、板荷载的楼面结构多有出现。
Derrick-type reinforced concrete beam often appears in the framework of house walls and building walls that don't support the weight of walls, boards and so on.
王艳丽，张云龙，费以原钢筋混凝土井式梁在屋面和非承墙、板荷载的楼面结构多有出现。
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