Objective: To probe the dynamic changing character of chemical elements contents in fetal lung and its physiologically nutritional significance.
目的：探讨胎儿肺中化学元素的含量及其时序分布特征和营养生理意义。
The contents of calcium and phosphate in tibias were determined by chemical analysis and the trace elements were detected by atom absorption spectrophotometer.
化学法测定胫骨钙和磷含量，原子吸收分光光度法测定铁、锌、镁、锰、铜、钴、铬和钼等微量元素的含量。
Methods: Conventional chemical methods and ICP-MS were used to determine contents of nutrients and rare-earth elements.
方法：分别采用常规的化学方法及电感耦合等离子体质谱法测定其营养成分及稀土元素的含量。
This paper demonstrates elements contents of soil in BeiJing City and the high grade and yield of crops has closely relationship with the following soil chemical elements.
论述了北京市土壤元素含量和农作物优质高产与土壤环境中化学元素有密切的关系。
As proved by study on chemical compositions, thermoelectricity and micro-elements compositions of galena, it is another important mineral with rich gold and silver contents except pyrite.
对方铅矿的化学成分、热电性和微量元素组成的研究表明，方铅矿是除黄铁矿外的另一种重要的富金、银矿物。
As proved by study on chemical compositions, thermoelectricity and micro-elements compositions of galena, it is another important mineral with rich gold and silver contents except pyrite.
对方铅矿的化学成分、热电性和微量元素组成的研究表明，方铅矿是除黄铁矿外的另一种重要的富金、银矿物。
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