| 摘要 |
Adjustable ramp ladder with alternating steps, which have at least a first set of steps with a plurality of inline plates joined by the adjacent sides thereof and a second set of steps with a plurality of inline plates joined by the adjacent sides thereof in such a way that the sets are joined in parallel by transverse cylindrical bars, which intersect the internal mid-point of the ends of each plate, and which allow each set of steps to be joined.
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