Home / Standards / GBT 25753.2-2010 GBT 25753.2-2010 Vacuum technology — Performance measurement methods for Roots vacuum pumps — Part 2: Measurement of zero flow compression ratio 真空技术 罗茨真空泵性能测量方法 第2部分:零流量压缩比的测量 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A