焊接符号的含义
问https://images.weserv.nl/?url=http://inews.gtimg.com/newsapp_ls/0/14371697381/0
答
国标就是国际标准的汉化
https://images.weserv.nl/?url=http://inews.gtimg.com/newsapp_ls/0/14371704350/0
https://images.weserv.nl/?url=http://inews.gtimg.com/newsapp_ls/0/14371707338/0
页:
[1]