?惰性气体保护层

惰性气体保护层 inert gas cover 惰性气体保护电弧点焊 inert gas spot welding ..

?惰性气体

惰性气体 foul gas; gas, inert; inactive gas = inert gas; indifferent gas; inert atmosphere; inert gas cover; inert gases; inertgas; insert gas; noble gases; physiological inert gas; rare gas element; tight weld..