鹅卵石主要化学成分是二氧化硅，其次是少量的氧化铁和微量的锰、铜、铝、镁等元素及化合物。
The main chemical components of the pebbles are silica, followed by a small amount of iron oxide and manganese, copper, aluminum, magnesium and other elements and compounds.
对电池工业中应用的锰化合物的应用情况、生产现状及质量标准进行了分析，并就电池用锰化合物的研究现状及发展前景进行了阐述。
This paper describes the application, production and quality of the manganese compounds used in battery industry. Comments have been made upon the research situation and prospects of these compounds.
对电池工业中应用的锰化合物的应用情况、生产现状及质量标准进行了分析，并就电池用锰化合物的研究现状及发展前景进行了阐述。
This paper describes the application, production and quality of the manganese compounds used in battery industry. Comments have been made upon the research situation and prospects of these compounds.
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