For example, the supermarket's four shelves are divided into several main frames
Shelves with mould frame main distinguish: actually the frame is made up of two single column and beam together is known as the main frame, deputy frame is subsequent connections (a single column and beam) and so on. It can also be called several layers
The main frame refers to a group of shelves which are assembled by vertical columns and assembled by beams. The accessory frame refers to the absence of a column, which is attached to the main frame and cannot be attached to the shelf independently. If you assemble four shelves into a column, you form a "first and third auxiliary" rack. In addition to the first group, you need two columns (the main frame), the other can and it...
The main frame is more than the vice frame and the main frame is connected to the main frame, which is two sets of conjoined shelves
