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The outer surface is plated with copper, and the raw material of the core wire is mainly aluminum. The outer surface is scraped and the aluminum core is silvery white. The quotation per unit of aluminum is about 1/4 of that of copper, and the same volume of aluminum is only 1/3 of that of copper, so the quotation per unit of copper clad aluminum is much cheaper than that of oxygen-free copper. Copper-clad aluminum has poor oxidation resistance, faster oxidation speed in humid environment, and poor tortuosity resistance of aluminum raw materials. It is not suitable for laying in the wall, and is only suitable for customers who do not have high demand for network stability or may temporarily establish a network.张槐笑道：这几年他可吃了不少苦。该剧是一部不恋爱，是不结婚，非常现实、关于家庭意义的温暖故事。　　由《无理的英爱小姐》《剩余公主》朴承龙导演执导。该剧改编自TNT同名美剧，讲述前保险调查官和盗贼们一起盗窃骗子的物品的故事。事实俱在，众人更加笃信几分，尹旭身上神奇色彩变的更加浓重，士兵心中的敬仰和信奉更加浓厚。该剧讲述了一个草食系宅男与两个机器人室友之间鸡飞狗跳、相爱相杀的搞笑故事[1] 。