HG/T 20637.6-2017 Compilation of engineering design documents for the automatic control of chemical installations Standardize the compilation of technical specifications for instruments (English Version)
2018HG/T 20637.6-2017 Compilation of engineering design documents for the automatic control of chemical installations Standardize the compilation of technical specifications for instruments
1970HG/T 20637.6-1998 Guid for preparation of engineering documents of instrumentation