L-Studio 3.1 光盘镜像文件 使用L-System建模时必要的工具-L-Studio 3.1 CD image file using L-System Modeling when the necessary tools

ACIS的几何造型技术，基于ACIS的图形系统开发-ACIS geometric modeling technology, the graphics system development based on ACIS

单自由度振动系统 基于MATLAB建模仿真,根据单自由度振动系统数学模型(Single degree of freedom vibration system modeling and simulation based on MATLAB, according to the mathematical model of single degree of freedom vibration system)