Home / Standards / LY/T 1971-2011 LY/T 1971-2011 Active 变压吸附精制氢气用活性炭 Standard Type LY ICS N/A CCS N/A Status Active Issue Date 2011-06-10 Implementation 2011-07-01 Centralized Committee 国家林业局 Issuing Authority 国家林业局