Installation quota, there are tubes, steel structures and general steel structure, how to distinguish between the two?
Installation quota, the pipe structure is hollow, pipe, solid steel, and the two how to distinguish between the problem, that is, hollow and solid division.
Installation is only water and electricity installation, that is, the general steel structure. I do not know what you said is the instructions, if it is the installation of water and electricity support, then the electrical and ventilation is a set of general steel structure (general iron component production, installation), the pipe is to use pipe stent installation.
