Home / Standards / GB/T 21272-2007 GB/T 21272-2007 Active Vapour vacuum pumps - Measurement of performance characteristics Measurement of back-streaming rate of pump fluid and the heating time 蒸汽流真空泵性能测量方法 泵液返流率和加热时间的测量 Standard Type GBT ICS 23.160 CCS J78 Status 现行 Issue Date 2007-12-20 Implementation 2008-06-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A