Home / Standards / HG 21503-1992 HG 21503-1992 钢制固定式薄管板列管换热器 钢制固定式薄管板列管换热器 Standard Type HG ICS 71.120 CCS G93 Status N/A Issue Date 1992-07-27 Implementation N/A Responsible Dept 化学工业部 Drafting Unit N/A