a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
双语例句
1. And how is it known that Mars had hafnium - 187 ?
那么是如何知道火星有铪 -187 的 呢 ?
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2. The field emission properties of hafnium coated carbon nanotubes ( CNTs ) were investigated.
研究了表面沉积铪膜并进行后处理对碳 纳米管 膜场电子发射性能的影响.
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3. This activator is acyl amine - the hafnium activator that ether is a foundation.
该催化剂为酰胺 - 醚为基础的铪催化剂.
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4. Chemical form of hafnium is perchlorate or nitrate.
