在cad里写的标注辅助，可以规范标注的位置，使得整齐又美观，目前只写了前3排标注的命令，分别是da1，da2，da3，懂lisp的可以自己写下去-Write in the cad-assisted annotation, you can mark the location of norms, making it attractive and tidy, the current write-only row 3 marked the first order, namely, da1, da2, da3, understand lisp can continue to write their own