By using commercialcopper foil and gold gluing oil, the sample of copper gilding was prepared with traditional gilding techniques.
用市售铜箔和金胶，采用传统贴金工艺制备贴铜样品。
2
Technological methods and processes for the preparation of commercialcopper sulfate and sponge copper with the high concentration copper waste solution are introduced.
介绍应用高质量浓度含铜废液制取工业硫酸铜与海绵铜的工艺方法和流程。
3
They conduct 150 times the electricity of similarly sized copper wires. However, because of technological difficulties, the commercial development of superconductor power-cable systems has been slow.