1.1 Modeling analysis There are two situations, one is that there is no steel pipe fastener to connect the scaffold, the other is that there is steel pipe fastener to connect the scaffold.
1.1 Modeling analyzes two cases, one is that there is no steel pipe fastener connected to the scaffolding, and the other is that the steel pipe fastener is connected to the scaffolding.
1.1 modeling and analysis of two cases, one is that there is no steel pipe fastener to connect the scaffold, the other is that there is steel pipe fastener to connect the scaffold.<br>