我们所有的钨钴环是免费和低过敏性。
All of our Tungsten rings are Cobalt Free and hypoallergenic.
采用复合变质方法，开发工艺简单、成本低的钨渣合金铸铁磨球是一种有效的途径，其材质性能可以满足使用的要求。
Manufacturing of alloy cast iron grinding ball by means of composite modification of tungsten slag is a feasible way due to its simple process, low cost and good product quality.
掺杂稀土氧化物的钨阴极材料以其较低的逸出功、更强的电子发射能力、低的工作温度等特性引起了极大关注。
The tungsten cathode materials added rare earth oxide have wide application foreground because of a variety of advantages including work function, electronic emission ability and work temperature.
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