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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.整条山谷虽然弯弯曲曲，然大致呈南北走向。31这一周，《回家》在新书榜上从四十多名，提升到现在的二十一名，这都是各位兄弟姐妹支持的结果，月下感激了。The proportion of those who pass the initial examination is generally about 10%, and those who are selected will undergo another totally enclosed re-examination. Candidates live together and cannot go home. Generally, they have to work for 2 to 3 consecutive days. The content includes very detailed physical examination, exercise and physical fitness tests, coordination and balance tests, will quality tests, etc. I will not elaborate on the specific subjects. In short, most of those who pass the preliminary examination will be eliminated at this level. The rest are all "high-quality products" that choose the best from the best.要是此战真的获胜了，我们还能立功呢。