GB/T 39374-2020.Leather- -Physical and mechanical tests-Determination of bending force. GB/T 39374规定...
GB国家标准
GB国家标准
GB国家标准
GB/T 39374-2020 皮革 物理和机械试验 弯折力的测定
GB/T 39374-2020.Leather-Physical and mechanical tests-Determination of bending force. 1范围 GB/T 39374...