以握笔画圆为测查任务，考察了学龄前儿童握笔姿势的发展趋势及特点。
This study was designed to investigate the developmental principle and characteristics of pencil grasps in preschool children by mean of their drawing circles.
目的分析银川市儿童青少年龋病患病的发展趋势及特点。
Objective To assess the dental caries prevalence of children in Yinchuan.
应用推荐