Home / Standards / GB/T 40401-2021 GB/T 40401-2021 Active Determination of density by volumetric displacement—Skeleton density by gas pycnometry 骨架密度的测量 气体体积置换法 Standard Type GBT ICS 19.120 CCS A28 Status 现行 Issue Date 2021-08-20 Implementation 2022-03-01 Responsible Dept 国家标准委 Drafting Unit N/A