impurity造句

• It is free from air, moisture or impurities .
  它不含空气，水份和杂物。
• Impurities tend to segregate at grain boundaries .
  杂质常常在晶粒间界偏析。
• This impurity must be purged away after death .
  这种污秽应该在死后加以净化。
• The buildup of impurities often results in defective plating .
  杂质的积累经常导致不良的电镀。
• The impurities present have an important effect on the rate of setting .
  存在的杂质对凝固速率有很大的影响。
• Semiconductors containing such impurities are called p-type semiconductors .
  含有这类杂质的半导体叫做P型半导体。
• The residual impurities can effect wet-process production in several ways .
  这些残留的杂质可能在几个方面影响湿法生产。
• Silica, in fact, is a desirable impurity because it is one of the reactants .
  硅石实际上是一种有用的杂质，因为它是一种反应剂。
• Calcitic limestone is mainly caco 3 with relatively small amounts of impurities .
  方解石灰岩，主要是由CaCo3和少量的杂质所形成。
• An aqueous caustic solution removes carrier gas impurities harmful to the detector cell .
  苛性碱溶液去除运载气体中对检测元件有害的杂质。
• It requires a second fusion to refine it completely by freeing it from its last earthly impurities .
  必须经过第二次熔解，除去最后的矿渣，才能提炼干净。
• In order to test the telescope for impurity and scratches, we will reverse it and view the bright sky .
  为鉴定望远镜是否不纯净或有划痕，可将其倒着看明亮的天空。
• When a donor or an acceptor impurity is added to a semiconductor, we say that the material has been "doped" .
  当半导体中加入了施主感受主杂质，我们就说该物质“掺杂”了。
• Organic impurities are sometimes present to such an extent that the rock must be calcined to remove them .
  有时候矿石中存在有机杂质甚多，以至必须将矿石进行煅烧以消除之。
• The impurity of supposedly pure subcellular fractions is a constant threat to the plant biochemist .
  以为亚细胞组分很纯而实际不纯的情况，一直是植物化学家感到难办的问题。
• To this day coal is said to be screened in the colliery when it has stone and other impurities removed from it .
  据说煤中掺有石子和其它杂质须去掉时，至今仍得把煤在矿上筛过。
• The solvent, in this case water, is passed through the membrane while the impurities are collected at the membrane's surface .
  这样，便使水通过半透膜，而杂质则聚集在膜的表面上。
• Since the buildup of impurities often results in defective plating such as discoloration or loss of corrosion resistance .
  因为杂质的积累经常导致不良的电镀，如脱色或丧失防腐性能。
• Impurities that promote deterioration of polymers can be foreign materials, such as residues from polymerization catalysts .
  促使聚合物劣化的杂质可能是外加的物质，如残存的聚合用催化剂。