单文档程序，实现制作绚丽的圆环，鼠标单极会改变圆心位置并变换颜色-Single Document procedures to achieve production of a beautiful ring, the mouse will change the center of a circle pole position and change the color

利用古地磁资料计算伦敦地区地磁极变化规律的工程源代码，这是根据古地磁极角变化规律进行磁极位置反演的重要程序，具有通用性，可用于其它地理位置的计算和演算！-Palaeomagnetic data to calculate the London pole variation of engineering source code, which is according to the paleomagnetic pole angular variation of the pole position of

在智能交通工程实践中，需要计算立杆和摄像机的安装位置，需要知道焦距、物距等参数，根据公式计算出工程实践中的位置，提供算法思路和VBA实现。-Intelligent traffic engineering practice, need to calculate the position of the pole and camera installation, you need to know the focal length, object distance and other parameter

系统稳定性判定，通过求解传输函数H(S)极点在S平面的位置来判断。若极点只存在于S左半平面，则系统稳定；否则，系统不稳定。-System stability is determined by solving the transfer function H (S) poles in the position to determine the S plane. If the S pole exists only in the left half plane, then the system is s