Children’s main job is to figure out how their complex world works. In order to master the things they need to at each developmental level they will test their parents.
孩子会主动学习这个复杂世界的法则，在不同的发育阶段，他们都会为作出各种尝试，以了解这些法则。
At last, this article is an approach to the index system of the developmental level of China's community business and some advices of improvement.
最后，针对中国社区商业存在的问题，提出了中国社区商业建设水平的指标体系和一些改进建议。
OBJECTIVE:To explore the effect of low level lead exposure during pregnancy on the auditory developmental level of infants through examination of auditory brainstem response.
目的：通过听脑干反应检查观察孕期低水平铅暴露对婴儿期听力发育的影响。
Conclusions The prevalence rate of overweight in infants aged 3-4 months is high. The developmental level of overweight infants is different from that of physical normal infants.
结论3 - 4月龄婴儿超重检出率较高，超重婴儿与体格正常婴儿的发育情况存在差异。
Conclusions The prevalence rate of overweight in infants aged 3-4 months is high. The developmental level of overweight infants is different from that of physical normal infants.
结论3 - 4月龄婴儿超重检出率较高，超重婴儿与体格正常婴儿的发育情况存在差异。
应用推荐