说明：  此系统用EXEL开发，摘要如下，对于血液供需模型，我们对某地区进行了系统模拟，为了使医疗中心花费最少，我们首先对三种情况进行分析，就是不举办活动，每30，60天举办活动，得出结果，每30天举办一次活动，费用最少。最后，我们对模型评价与推广，还有个人的心得体会。
(system used EXEL development, summarized below, the blood supply model, we have certain areas of the system simulation, in order to spend at least a medical center, we first of the three, is not organizing activities, held every 415.70 days, the outcome of each 30 days of an event, at least cost. Finally, we model for evaluation and promotion, there are personal experiences.)