major cycle impurity 主要杂质
Purifying Gallium Only by this way, because of some major impurities separated out seriously, often forms individual impurity element to exceed mark, and causes product grade to reduce.
单一电解法提纯镓，由于一些主要杂质析出严重，常常形成个别杂质元素超标，造成产品品级降低。
The results showed that good purification effects can be obtained, in which not only major coarse impurity particles was removed but also shrinkage porosity was effectively abated.
研究表明，该方法可以实现良好的净化效果。不仅过滤了绝大多数粗大夹杂物，而且对减少显微缩孔十分有效。
The impurity of iron is one major heavy-metal contamination on the silicon wafer. Surface photo-voltage method(SPV) can be used to accurately measure the iron contamination within the silicon wafer.
铁杂质是硅片制造过程中常见的重金属沾污，表面光电压（SPV）法可很好地用于测定P型硅中铁杂质。
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