Methods 1 339 children aged 0~14 years old who received healeh physical examination in the Child Health Care Clinic of Qing an Group Staff s Hospital were randomly selected and their serum contents of 5 microelements/macroelements of zinc,iron,copper,calcium and magnesium in peripheral finger blood were detected by using atomic absorption assay.
方法随机选取1 339例在庆安职工医院儿保门诊健康查体的14岁以下健康儿童,用原子吸收法分别测定末梢手指血中的锌、铁、铜、钙、镁等5种微(宏)量元素含量,分析并比较各年龄组儿童各种元素的含量。
The effect of the sawtooth shape tip on tip vortex of the propeller is studied with the theory of vortex dynamics in the paper.
本文用涡动力学理论分析了锯齿形叶梢对螺旋桨的梢涡的影响。