Sales management system for information on sales day

代码说明：

商品销售管理系统对商品销售信息进行日常的管理，如销售开单、销售收款、销售退货，迅速准确地完成各种销售信息的统计计算和汇总工作，快速打印商品销售报表等功能 -Sales management system for information on sales day-to-day management, such as sales billing, sales of receivables, sales returns, quickly and accurately complete a variety of sales information and summary of statistical computing work, fast print sales reports and other functions