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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.早就交给我了。当红电视情感节目主持人聂冰（林嘉欣 饰）在年过三十之际突然感到情感上的困惑：她的父母婚姻失败，母亲（丛珊 饰）整日唠唠叨叨，父亲（朱时茂 饰）娶了聂冰的小学同学，追求者由爱生恨恶语相向……这一切都让她疲惫不堪。这几天，我跟淼淼每天都会做好吃的。姐姐得了白血病，从小被父亲抛弃的妹妹不记仇隙，献上自己的骨髓。姐姐得救，她的恋人却爱上妹妹。姐姐把隐痛埋在心底，在妹妹遭遇车祸失去生育功能后，她以自己的卵巢帮助妹妹重做一个女人和母亲。妹妹怀孕后又得绝症，为了孩子，也为了她刻骨铭心的爱的结晶，她用自己的死为孩子打开新生命的通道。爱情、亲情、友情从这对姐妹的磨难中回到各色人等的心间，生离死别的打击面前，是超越私利的人间真情和无私的奉献。爱，因此强大，生命，因此而崇高无畏。这是一部直面生死的爱情绝唱，一对同父异母姐妹血肉互献的爱的礼赞，更是一个年轻母亲以生命抒写伟大母爱的动人颂歌！BaiDuInterview.prototype = new Interview ();Note: The above codes are all done according to the book. They all read the code of the book. The most important thing is that we understand the implementation of the policy mode. For example, the above form verification function is the code packaged in this way. We usually use JQuery plug-in form verification code to be packaged in this way. Therefore, we can also use this method to package forms and other learning in the future.