GB/T 37199.1-2021塑料聚丁烯(PB)模塑和挤出材料第1部分:命名系统和分类基础标准
英文:Plastics—Polybutene(PB) moulding and extrusion materials—Part 1:Designation system and basis for specifications GB/T ...
英文:Plastics—Polybutene(PB) moulding and extrusion materials—Part 1:Designation system and basis for specifications GB/T ...