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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.道明寺司（松本润饰）被母亲（加賀まりこ饰）送去纽约留学后，3个月后突然断了联系。因此而焦躁不安的杉菜（井上真央饰）难耐相思之苦，她决定去美国找司，相逢后没有喜悦，没有惊讶，对方反而冷冷地甩出“和你的游戏已经结束了。”这样的话。杉菜捧着颗受伤的心回到日本，不久即传来司和大河原滋（加藤夏希饰）的订婚消息，滋是个开朗活泼，全无心机的大小姐，她毫不掩饰自己喜欢司的心情，还把杉菜当成好朋友，这让杉菜很是为难。但无法相信司已经不爱自己的杉菜在西门（松田翔太饰）等人的鼓励下，试图和他修补关系。就在这时，花泽类（小栗旬饰）突然向自己表白了？好事多磨，杉菜和道明寺的爱情终会结出正果吗？年前我娘差一点就要帮我议亲了，幸亏我说等我考了进士再说，结果就等来了张姑娘奉旨选婿的事。周凯参与走私，被身为缉毒警察的弟弟周超逮捕入狱。三年后，周凯出狱，改过自新。曾经的手下阿仓已为毒贩头目，为获取周凯的海外客户资料，设计加害周凯。周凯与警方合作，逮捕了阿仓，两兄弟重归于好。　　随着“中国共产党万岁”的低声欢呼，一个在日后改变中国、改变世界的政党产生了。}