The status and changes in resources of natural manganese dioxide and zinc were analyzed.
分析了我国天然二氧化锰和锌的资源现状和变化；
This article described the resources distribution, quality evaluation and annual demands of natural manganese dioxide in China.
本文介绍我国天然二氧化锰资源分布、质量评估和年需求量。
This article described the resources distribution, quality evaluation and annual demands of natural manganese dioxide in China.
本文介绍我国天然二氧化锰资源分布、质量评估和年需求量。
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