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Why is the shelf sub-frame and sub-frame? How to distinguish between the main and the sub-frame
Answer: the shelf is a buckle structure, the column has two rows of holes, the sub-frame of the beam can be linked to the front of a shelf column, as long as the shelves on a row, you can extend the infinity, the beginning of the first Frame, follow-up all called sub-frame. The main frame is more than a side pillar.