Hoang Giang Share
Janusz
办美国文凭加拿大文凭澳洲文凭英国文凭学位证毕业证成绩单
Veinas bọt EPE máy móc
Wendy Ye
6 months ago
few know the secret trick of welding galvanized square pipes | arc welding
6 months ago
few know the secret trick of welding galvanized square pipes | arc welding
![FCAW 2G : How to Prevent UNDERCUT in Back Bead (2G 용접에서 백비드 언더컷을 방지하는 요령) [sub : KOR, ENG]](http://i.ytimg.com/vi/RNawRbxb7Do/mqdefault.jpg "FCAW 2G : How to Prevent UNDERCUT in Back Bead (2G 용접에서 백비드 언더컷을 방지하는 요령) [sub : KOR, ENG]")
