Home / Standards / GB/T 21188-2007 GB/T 21188-2007 Active Measurement of gas flow by means of critical flow Venturi nozzles 用临界流文丘里喷嘴测量气体流量 Standard Type GBT ICS 17.120.10 CCS N12 Status 现行 Issue Date 2007-11-14 Implementation 2008-05-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A