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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.二十世纪六十年代，在“黑云压城城欲摧”的国际形势下，毛主席一声号令：好人好马上三线。军人后代张力军、农民的儿子马朝阳、“资本家千金”陆若文和留苏归来的向晴等这些充满斗志和激情的年轻人，来到了大西南的崇山峻岭，用生命和青春实践自己的理想同时，又演绎着牵肠挂肚的爱情角逐。 一口京腔的大工匠刘连柱因为爱徒梁玉强喜欢上陆若文，竟要断了师徒关系。直到梁玉强在发射基地因排除故障而牺牲，刘连柱都不肯原谅。但谁也不敢相信，害了他爱徒陆若文居然能请他再次出山，为远程火箭试飞成功一显身手。一生梦想当将军的张力军不幸英年早逝，临终，司令员才发现这个一身毛病的小子却有很多不为人知的贡献。马朝阳出席了全国科技大会，火箭伺服系统的研发成果获得最高奖项，在张力军的坟头，闪光的奖章证明了他生命的意义和价值。转向内室方向，这门亲算是毁了。玉木宏主演的《极主夫道》将推出衍生剧《3年辰组 极主夫老师》。故事从龙（玉木宏）代理放产假的家庭科教师而就任新班导开始。川口春奈演3年辰班的副班导。志尊淳、古川雄大、玉城Tina、白鸟玉季演3年辰组的学生。I'd like to share with you another tool, full title and full martial arts archive.背景设在维多利亚时代的医疗喜剧。