| 摘要 |
Disconnected slits are disposed between one end of at least one of the first and the second side plates coupled to a retaining pin and a bottom plate of a rack body with an engaging mechanism to form a free end thereby allowing an operation of an insertion of the retaining pin into or a separation thereof from the screw hole to be more convenient by offsetting the free end outward to lengthen a distance between the two opposite retaining pins.
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