DIN 30675-1
External corrosion protection of buried pipes; corrosion protection systems for steel pipes
现行
发布日期 :
2001-09-01
实施日期 :
DIN 30675-2
External corrosion protection of buried pipes; corrosion protection systems for ductile iron pipes
现行
发布日期 :
2001-04-01
实施日期 :