目的探讨正常胎儿器官组织和母血中多种常量元素的水平、分布以及元素间的关系。
Objective To study the contents, distributions and correlations of some macroelements in the organic tissues of healthy fetus and the maternal blood.
目的：通过了解铁蛋白在胎盘组织中的定位及含量，探讨其在母胎铁转运中的作用。
Objective: To investigate the localization and quantity of ferritin in placental villous tissue and its implications.
采用聚焦光束热源在45钢母材上获得了镍基合金粉末堆焊层，研究了堆焊层的物相组成及母材热影响区的微观组织特征。
The Ni based alloy powder surfacing layer was obtained by light beam surfacing on the 45 steel and the microstructure of heat affected zone(HAZ) and the phase of the surfacing layer were studied.
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