Home / Standards / JG/T 246-2009 JG/T 246-2009 Active 混凝土含气量测定仪 Standard Type JG ICS N/A CCS N/A Status Active Issue Date 2009-04-20 Implementation 2009-12-01 Centralized Committee 住房和城乡建设部 Issuing Authority 住房和城乡建设部