区域地理环境因素对宁夏泾源县儿童呼吸系统疾病的影响

李浩, 张明鑫, 汪冉

The effects of regional geographical factors on children's respiratory diseases in Jingyuan, Ningxia

LI Hao, ZHANG Mingxin, WANG Ran

图1 研究区位置

Fig. 1 Location of the study area