用VB实现的坐标转换，功能简单了点，但很实用，WGS-84,B-54之间的相互转换。-VB coordinate conversion, a simple functional, but very useful, WGS-84, B-54 between the conversion.

设计并测试一个名为Rectangle的矩形类，其属性为矩形的左下角与右上角两个点的坐标， 能计算矩形的面积。 -Design and test a class called Rectangle rectangle, bottom left corner of its property and the upper right corner of the rectangular coordinates of two points, to calculate the area of the

通过连接数据库来查找xyz坐标点的文件中的重复项-By connecting to the database to find the xyz coordinates of points of duplicate entries in the file