[国外标准] ASTM F512-95(2001)e1 Standard Specification for Smooth-Wall Poly(Vinyl Chloride) (PVC) Conduit and F
[国外标准] ASTM F512-1995(2006) Standard Specification for Smooth-Wall Poly(Vinyl Chloride) (PVC) Conduit and F
[国外标准] ASTM F512-06 Standard Specification for Smooth-Wall Poly(Vinyl Chloride) (PVC) Conduit and Fittings