请问草图状态下如何选定一条线的中点?
比如下图,在无画图命令的条件下左边那条线的中点怎么才能选定变为黄色球球?
data:image/png;base64,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
补图啊啊啊
过滤器里面中点选项打开 11以下没有这功能,十一以上就可以选了 把过滤器里的其他选项都点暗,只留这一个
页:
[1]