Coins made of copper, bronze and copper-nickel can change over time.
由铜，青铜和铜镍线制造的硬币可能随时改变。
Tin welding parts and lead-tin alloy die casting, zinc, beryllium bronze, phosphorus copper alloy in electroplating copper with commonly used before also gets to improve adhesion.
锡焊件、铅锡合金、锌压铸件、铍青铜、磷铜等合金在电镀前也常用预镀铜来改善结合力。
We are continuously developing copper door series also have been developed bronze, copper decorative copper crafts and flowers.
我们在不断开发系列铜门的同时，还相继研发出铜雕、铜花等铜饰工艺品。
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