CAM350导入Gerber步骤：https://wenku.baidu.com/view/dc427d6d67ec102de2bd8973.html
CAM350常用快捷键：https://www.renrendoc.com/paper/124268225.html
CAM350对比两个gerber之间的差异: https://max.book118.com/html/2020/0617/5043341143002304.shtm