cad在画大样图的时候，需要把图形放大n倍数的时候，尺寸会跟着放大，要用手工一个一个改尺寸为字符，这个命令可以自动把测量的数据转为字符，放大n倍数都不会变尺寸值-cad when painting large drawing, you need to put the graphic amplification factor when n dimensions will follow enlarge, use manually change the size of the characters o