An environmental friendly Bi-brass with cutting-free and excellent properties was developed to substitute for Pb-brass.
研制了一种性能优异的易切削铋黄铜来替代有毒的铅黄铜。
It is simple and quick to determine trace Pb and Bi in pure copper using the graphite furnace atomic absorption spectrophotometry.
石墨炉原子吸收光谱法测定纯铜中痕量铅和铋，方法可靠，简单快速。
The impurity elements as Cd, Zn, Tl, Pb, Bi were removed from the crude indium by the vacuum process instead of the traditional way using reagent.
利用金属饱和蒸汽压的不同，采取在一定真空度下使铟熔化脱除粗铟中的镉，达到粗铟提纯的目的，同时考察了粗铟中其他杂质元素的变化。
In, Bi, Pb etc. play a more important role than Al, Ca etc. According to the experiments, a proper ratio is pronounced and the influence m...
无汞锌粉中铟、铋、铅等元素的作用明显，而铝、钙等元素的作用较小。
In, Bi, Pb etc. play a more important role than Al, Ca etc. According to the experiments, a proper ratio is pronounced and the influence m...
无汞锌粉中铟、铋、铅等元素的作用明显，而铝、钙等元素的作用较小。
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