impurity

• These use carbon or mesh to catch impurities
  他们用炭或者滤网来阻隔不干净的东西。
• Ivory or yellow flaky solid , no foreign impurity
  象牙色或黄色片状固体，无外来杂质
• Research on removing impurities effect of carding machine
  梳棉机去除杂质效果的研究
• Method of test for organic impurities in fine aggregate
  细集料中有机杂质的试验方法
• It is iron and graphite that the impurity is common
  杂质常见为铁质和石墨。
• And low levels of impurities , e . g
  和杂质低例如硫份的一种理想的解决方案。
• Pure with zhengdong s jade quality , the impurity is few
  杂质和阗玉质纯，杂质极少。
• These use carbon or mesh to catch impurities
  他们使用碳或滤网来捕捉杂质。
• Fruit and vegetable products - determination of mineral impurities
  矿物杂质含量的测定
• Oilseeds - determination of content of impurities
  油料种子.杂质含量的测定