另外，对现有的银铜类合金接触线应改善它的平直度，以降低离线率，使质量达到国外同类先进产品的水平。
It must improve the regularity of the present cupreous alloys in order to reduce the rate of contact loss and make its quality reaches up to the level of excellent overseas congeneric product.
另外，对现有的银铜类合金接触线应改善它的平直度，以降低离线率，使质量达到国外同类先进产品的水平。
It must improve the regularity of the present cupreous alloys in order to reduce the rate of contact loss and make its quality reaches up to the level of excellent overseas congeneric product.
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