Dimensions show the geometric measurements of objects, the distances or angles between objects, or the X and Y coordinates of a feature. AutoCAD® provides three basic types of dimensioning: linear, radial, and angular. Linear dimensions include aligned, rotated, and ordinate dimensions.
标注可以显示对象的形位测量值、对象之间的距离或角度，以及特征的 X 坐标和 Y 坐标。AutoCAD® 提供了三种基本类型的标注：线性标注、半径标注和角度标注。线性标注包括对齐标注、转角标注和坐标标注。
You can create dimensions for lines, multilines, arcs, circles, and polyline segments, or you can create dimensions that stand alone.
可以为直线、多线、圆弧、圆和多段线线段创建标注，也可以创建独立的标注。
AutoCAD draws dimensions on the current layer. Every dimension has a dimension style associated with it, whether it is the default style or one you define. The style controls characteristics such as color, text style, arrowheads, and the scale of the elements in a dimension. Dimensions do not support object thickness. Style families allow for subtle modifications to a base style for different types of dimensions. Overrides allow for style modifications to a specific dimension.
AutoCAD 在当前图层上绘制标注。每个标注均与一个标注样式相关联，无论此标注是默认标注还是用户定义的标注。样式可以控制诸如颜色、文字样式、箭头和线型比例等标注特征。标注不支持厚度信息。样式族可以针对不同类型的标注，对基本样式进行细微的修改；而替代可以对特定的标注进行样式修改。
For more information about dimensions, see “Change Existing Objects” in the AutoCAD User's Guide.
更多关于标注的详细信息，请参见《AutoCAD 用户手册》中的“更改现有对象”。
