TIMSS 2019 International Database: Grade 4 - Trends in International Mathemat...

Trends in International Mathematics and Science Study 2019 TIMSS 2019 marks the seventh cycle of the study and provides 24 years of trends. Conducted every four years since...国际数学与科学趋势研究（Trends in International Mathematics and Science Study，TIMSS）2019届为本研究的第七轮调研，涵盖了24年的趋势数据。该研究自[原文未完整说明起始年份]起每四年举办一次。