一个进行按位存储的容器，BitVector，位向量。可以根据加入的数据自动改变容器大小，提供方便的访问接口。-Carried out by a digital storage containers, BitVector, bit vector. Automatically change the container s size when data be added, provide convenient access interface.

EWDraw 3D is a powerful vector graphics ActiveX for 3D and 2D visualisation and animation. You can use it for CAD,CAM,GIS and others. The EWDraw is based on Open CASCADE geometric kernel and openGL. The component is realized as a run-time Windows 3