welder qualification/ welder qualified certification
相关英语词汇推荐
- ground chamotte
- continuous operation
- austenite region
- continuous strip mill
- oxyacetylene torch
- polymorphism
- pattern metal
- ampangabeite
- steckel mill
- inoculant alloy
- moisture
- lapped T-joint;flanged T-joint
- sullage head
- bush,bushing
- mixed scrap
- roller cold pilgering mill
- fire end
- threee-strand continuous casting machine
- lacquerware
- casting powder