GB/T 20671.1-2020非金属垫片材料分类体系及试验方法第1部分:非金属垫片材料分类体系标准
英文:Classification system and test methods for nonmetallic gasket materials—Part 1:Standard classification system for non...
英文:Classification system and test methods for nonmetallic gasket materials—Part 1:Standard classification system for non...