根据站点的经纬度判断这个站点是否在某个区域内。对使用vba进行几何关系编程有参考价值。-judging a site is inside or outside of a region，by thier longtitude and latitude

可以通过已知的相对磁导率、内径、外径、高度和电感值计算匝数，也可以计算电感和相对磁导率。-Can be known relative permeability, inside diameter, outside diameter, height and inductance calculation number of turns, also inductance and relative permeability can be calculated.