GB/T 39821-2021塑料不能从规定漏斗流出的模塑材料表观密度的测定标准
英文:Plastics—Determination of apparent density of moulding material that cannot be poured from a specified funnel GB/T 39...
英文:Plastics—Determination of apparent density of moulding material that cannot be poured from a specified funnel GB/T 39...