GPS的发展历史背景及现状 运用GPS进行实际的定位和导航-GPS development of the historical background and current situation of the actual use of GPS positioning and navigation

实现支票打印，支持并口针式打印机，access数据库，支持历史打印数据存储-Implement check printing, support for parallel port dot matrix printer, access databases, store the print data to support historical

一款针对电脑税票打印的套打小软件，可以实现精准打印，并可以存储历史税票记录。方便查看历史-A tax receipt for the computer to print Printing With a small software, can achieve precise print, and can store historical tax receipt records. Easy viewing history

vb动态曲线查询，查询打印历史曲线，可以以各种方式显示曲线-vb dynamic curve queries, query print historical curve, the curve can be displayed in various ways