回答：当一个供应商的发货量达到或几乎达到货车的满载重量时，就应该使用这种方式。
Answer: This method is used when a supplier is used when the supplier can deliver a full or almost full load.
件一般只需占用货车的部分载重量。这种情况下，一辆货车一个接一个地从供应商那里取货，最后满载货物回到厂中，就显得比较合理。
In this case it makes sense for one truck to pick up the loads one after another, and finally come back with a full load to the plant.
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