JT/T 33.12-1993 Technical grade standards for workers in the transportation industry Highway engineering and navigation engineering Subgrade workers (English Version)
This standard specifies the levels, knowledge, skills and work examples of roadbed workers. This standard applies to the training, assessment and use of road foundation workers in highway engineering and navigation engineering.
JT/T 33.12-1993 history
1970JT/T 33.12-1993 Technical grade standards for workers in the transportation industry Highway engineering and navigation engineering Subgrade workers