必须将货物提升到的最大上层架子高度是多少？这将确定举升高度并定义标称容量和剩余容量。货叉必须在没有足够间隙的情况下将货盘提升到顶部搁板上方，以将负载放置在顶部搁板上（还必须考虑到桅杆的偏斜）。

        What is the maximum top shelf height onto which loads must be lifted? This will determine height of lift and define nominal and residual capacities. The forks have to lift the pallet above the top shelf with sufficient underclearance to place the load on the top shelf (mast deflections must also be taken into account).