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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.高冷转校生邂逅帅气学长，落魄大叔碰上鬼马小精灵，服装系美女收到神秘快递……三个特殊的守护者，如何治愈大城市里孤独的心？IT狂人再度袭来，Moss，Roy和Jen第四季强势回归。剧中他们依然在公司地下室的IT部门工作，依然会常常遇到各种各样的爆笑事件。Jen（凯瑟琳·帕金森 Katherine Parkinson 饰）想挑战自我，自荐担任公司的娱乐总监一职，然而其他人并不看好她，包括她的上司Douglas（马特·贝里 Matt Berry 饰），Jen能否做好这个工作？与此同时，Roy（克里斯·奥多德 Chris O'Dowd 饰）失恋了，女友一声不吭地离他而去，这让他倍受打击，整天唉声叹气，大家对此束手无策。Moss（理查德·艾欧阿德 Richard Ayoade 饰）则遇上了好事，他在一个火爆的电视节目中赢得了冠军，还因此受邀到一家俱乐部，天才冠军们聚集一堂，Moss会迎来怎么样的天才对决？第四季的IT狂人，精彩纷呈不容错过。Reference: Baidu Encyclopedia: World War I Baidu Encyclopedia: World War II英布开门见山，现在可不想和随何这样绕圈子浪费时间。1. Are the emergency measures perfect