In 200 1 year, the General Administration of Quality Supervision, Inspection and Quarantine proposed to upgrade the basic layout size of primary and secondary school textbooks that have been popular for many years from 16 to 16, that is, 2 1cm multiplied by 29.7cm.

History is a discipline that records and explains a series of historical events in the process of human activities. It systematically records, explains and studies past events and behaviors and serves as a reference for future actions.