GB/T 39372-2020.Leather-Physical and mechanical tests-Determination of percentage extension. 5.2试样 的...
GB国家标准
GB国家标准
GB国家标准
GB/T 39372-2020 皮革 物理和机械试验 伸长率的测定
GB/T 39372-2020.Leather-Physical and mechanical tests-Determination of percentage extension. 1范围 GB/...