Home / Standards / DL/T 638-1997 DL/T 638-1997 Abolished 火力发电厂锅炉炉墙检修工艺规程 Standard Type DL ICS N/A CCS N/A Status Abolished Issue Date 1998-01-22 Implementation 1998-07-01 Centralized Committee 电力工业部 Issuing Authority 电力工业部