Home / Standards / GB/T 28729-2012 GB/T 28729-2012 Abolished Nitrous oxide 氧化亚氮 Standard Type GBT ICS 71.100.20 CCS G86 Status 废止 Issue Date 2012-09-03 Implementation 2013-02-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A