| 摘要 |
The rack contains at least a column member and at least a beam. The column member contains a support element with at least a vertical chamber. The chamber has an upper section, an enlarged middle section, and a lower section sequentially in this order. The width of the lower section is smaller than the width of the enlarged middle section, but larger than the width of the upper section. The width of the beam is equal to the width of the lower section and the thickness of the beam is smaller than the width of the upper section. The beam is dropped into the chamber by its smaller thickness, turned for an angle in the enlarged middle section, and rested reliably in the lower section. |
