cad二次开发lisp源码，含演示，源码及编译文件

(gpselable 组名 key) 改变单个组的可选择性。

(gpsselable key) 改变所有组的可选择性。

参数: key = 0 不可选

1 可选

T，nil 或任何非0，1的字符、数字， 循环切换开关。

-lisp source cad secondary development, including presentations, source code and compiled files (gpselable group name key) to change a single group of optional. (gpsselable key) change in all groups of optional. Parameters: key = 0 is not an optional one optional T, nil, or any non-0,1 characters, numbers, the cycle switch.