Main material for installing: all kinds of channel steel, angle iron and plate iron.
Main material for installing: all kinds of channel steel, angle iron and plate iron.
（六）安装主要材料：各种型号的槽钢、角铁及铁板。
Main material for installing: all kinds of channel steel, angle iron and plate iron.
（六）安装主要材料：各种型号的槽钢、角铁及铁板。