Investigation and analysis on the status of outdoor activities of preschool children in Shanghai
LIU Mei-yan, WU Dan, HUO Yan-yan, WANG Xiu-lian, GUO Qian-wen, SUN Fan-fan, JIANG Lian, SHI Hui-jie, CHEN Jin-jin
journal1 . 2020, (6): 609 -612 .  DOI: 10.11852/zgetbjzz2019-0743