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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.刘邦抬头环视众人，说道：魏王所言不虚，即可就整军备战，在城外迎战项羽。《后宫》是由安以轩，冯绍峰，杨怡等主演的深宫女人大戏于2011年11月6日在浙江卫视全国独播。主要讲述了明宪宗时期，杨永为了替兄报仇，入宫成为乐师相遇人生挚爱春华，却因同在宫中身不由己，有情人近在咫尺却形同陌路。军丁领命，小跑而去。约两个月后的12月24日。Let's assume that the three teams are team A, B and C