ISO 649-2:1981现行
Laboratory glassware - Density hydrometers for general purposes Part 2: Test methods and use
出版：International Organization for Standardization
专家解读视频
GB/T 21784.2-2008 - Identical
NEN ISO 649-2:1982 - Identical
DIN 12791-3 (1983-06) - Identical
BS 718:1991 - Equivalent
UNI ISO 649-2:1983 - Identical
NFT 20 050:1985 - Identical
NFB 35 511:1983 - Identical
