有个国有中型企业，接到一批需要加工零件的订单，员工们非常高兴，可是高兴之后却发现问题了，原来这家企业能够加工这批零件的机床有限，如果仅仅为了这批加工任务而新添机床的话，那么既不合算也不必要，因为加工完这批零件后很可能这些机床又要闲置起来，所以大批量购买肯定不行，但这批订单又必须要完成，那么这么办呢？很想请你帮忙设计一个加工任务的顺序，使得完成这批订单所需要使用的机床数量最少。-There is a state-owned medium-sized enterprises, received a batch of orders for parts to be machined, the staff are very happy, but happy to have found the problem after the original processing of this enterprise to a limited group of machine parts, if only for these processing tasks added a new machine, then both uneconomical and unnecessary, because the processing after completion of these parts may have to idle up these machines, so the bulk purchase will not do, but these orders must also be completed, then so should we do? Would like to ask you to help design a sequence of processing tasks, making the completion of these orders need to use the least number of machines.