major metal meaning in English
主要金属
Examples
- Physical properties of major metal elements
主要金属元素之物理性质 - The major metal resources are hg - sb , pb - zn and au deposits , which are different but correlative in source materials , physical - chemical conditions and the characters of mineralizing fluid
它们在物质来源、成矿物化条件和成矿流体性质等方面既有联系又有差异。 - This paper outlines the research overview of reaction mechanism of vinyl acetate synthesis from acetic acid and acetylene catalyzed by active carbon - zinc acetate , and reviews the researches on the catalyst supporter , the major metal catalyst , the promoters and the deactivation mechanism at home and abroad
摘要从乙炔法气相合成醋酸乙烯的反应机理入手,综述了醋酸锌活性炭催化剂的载体、活性组分、助剂以及失活机理的国内外研究情况。 - Ge and cd holded the same origin as major metal elements . the content of ge in no . 3 ore body approaching the earth ' s surface is much larger than that of deeper ore body , owning to germanium ' s high activity in the earth ' s surface , relatively low - temperature and biology action . the ore - forming pattern can be generalized " atmosphere water leaching - convection circle - metallogenic "
Ge 、 cd与主金属元素的来源一致,在接近地表的3号矿体中ge含量远大于其下部的6号和8号矿体,其原因在于锗在表生条件下的高活动性、相对低温易于锗的富集以及生物可能参与了锗的富集。