GB/T 17224-1998

Health standard of daily learning time for secondary school students

STANDARD published on 21.1.1998

English, Chinese -
electronic design (pdf) (248.80 USD)

The information about the standard:

Designation standards: GB/T 17224-1998
Note: WITHDRAWN
Publication date standards: 21.1.1998
Country: Chinese technical standard
Category: Technical standards GB