VC写的酒店管理系统，带完整的源码和开发文档，更改后可做商业用途。-VC writing hotel management system with complete source code and developer documentation, changes can be done for commercial purposes.

提取含K、M矩阵（先用nastran提取M、K，保存到.pch文件）-Extract containing K, M matrix (M, first extract K, use NASTRAN to save to an.Pch file)