Copper, with its extremely high coefficient of expansion, expands more during heating than steel does.
由于铜的膨胀系数特别高，铜在加热时比钢膨胀得多。
Copper and plastic coefficient of expansion, and, therefore, more close to the plastic used in electroplating electroless copper plating coating layer as conductive.
金属铜与塑料的膨胀系数比较接近，因此，在塑料电镀中常用化学镀铜层作为电镀的导电镀层。
The form of copper occurrence in contaminated soil in a smeltery site was discussed comparatively by continuous chemical digestion, with the coefficient of biologic effectiveness to copper calculated.
采用化学连续浸提法对冶炼厂污染土壤中铜的赋存形态进行了比较分析，并且计算了铜的生物有效性系数。
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