cad中心线的快捷键是CM和CL。快捷键的操作方法如下:
工具:LenovoXiaoXin-15IIL2020、Windows10、cadR47.0.0。
1、在cad命令行中输入图层指令“LA”,按下空格键。
![](https://iknow-pic.cdn.bcebos.com/1e30e924b899a901bba37aa10f950a7b0308f597?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、打开图层管理器,选择“中心线层”图层。
![](https://iknow-pic.cdn.bcebos.com/472309f7905298226aa21854c5ca7bcb0b46d497?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、之后在命令行输入圆中心线快捷键“CM”,按下空格键。
![](https://iknow-pic.cdn.bcebos.com/d52a2834349b033b7419dd4d07ce36d3d439bd97?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、在编辑区中,选择圆弧或圆作为对象。
![](https://iknow-pic.cdn.bcebos.com/902397dda144ad341e2ea610c2a20cf430ad8597?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、按空格键确定后,即可画出圆的中心线。
![](https://iknow-pic.cdn.bcebos.com/8435e5dde71190ef126ab348dc1b9d16fcfa6097?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
6、对于矩形,在命令行输入矩形中心线快捷指令“CL”,按下空格键。
![](https://iknow-pic.cdn.bcebos.com/0eb30f2442a7d9330b39c5e4bf4bd11372f00197?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
7、指定矩形中心线参考对象,即可画出矩形的中心线。
![](https://iknow-pic.cdn.bcebos.com/024f78f0f736afc3ab9d1ef2a119ebc4b6451297?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)