当堆垛机装载能力大于一时，在不同的取货队列排序规则下，该算法都可较大程度地减少堆垛机的平均行程时间；
When the capacity of crane is large than one unit, the crane's expected travel time can be reduced quite large by the algorithm.
当堆垛机装载能力大于一时，在不同的取货队列排序规则下，该算法都可较大程度地减少堆垛机的平均行程时间；
When the capacity of crane is large than one unit, the crane's expected travel time can be reduced quite large by the algorithm.
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