1. Objective To explore incidence of child obesity in Zhengzhou area and intervention measures. Ŀ���˽�֣�ݵ�����ͯ���ַ��������̽����Ԥ��ʩ��
2. Objective To reduce the patients incidence of deep venous thrombosis after extremitas inferior trauma and operation. Ŀ�Ľ��ǿ���֫���˼������������Ѫ˨�γɵķ����ʡ�
3. Grasp the operation indicatio reasonablely, raise obstetrics quality, cut down incidence rate of asphyxia neonatorum. ��������������Ӧ֤����߲���������������������Ϣ�ķ����ʡ�
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1. the relative frequency of occurrence of something
2. the striking of a light beam on a surface
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