Is polystyrene a polycyclic aromatic? Is not all the hydrocarbon chemical products are carcinogenic, such as the production of foam raw materials: polystyrene
Construction of the outer steel pipe is generally a diameter of 48mm wall thickness 3.5mm specifications
In the installation of two wall can be removed after the wall) → third, four-step large bar and a small bar → with a bar → then pole → plus scissors support → shop Scaffolding (yuan extension fastener steel scaffolding erection sequence)
This is a lot, but do you say the site is the construction site?
