GB/T 39371-2020.Leather-Physical and mechanical tests- Determination of softness. GB/T 39371规定了皮革柔软度...
GB国家标准
GB国家标准
GB国家标准
GB/T 39371-2020 皮革 物理和机械试验 柔软度的测定
GB/T 39371-2020.Leather-Physical and mechanical tests-Determination of softness. 1范围 GB/T 39371规定了皮革...