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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.这份一见钟情，终成铭心刻骨的相思。青木狠狠地一拳砸在竹园月洞门边，哽咽呜咽。寻找心中的彩虹，憧憬彩虹另一边的美丽世界。三国时期，战火纷起。年轻的华佗在家乡亳州给百姓看病，过着自由洒脱的日子。华佗妙手让太守女儿明心起死回生，获得了神医美名，也从此与明心结下不解之缘。为了研制麻沸散给明心治疗眼睛，华佗开始游历寻药。在都城，华佗与英雄关羽、奸雄曹操和师兄吴思德屡有交集，见识了官场险恶，世态炎凉。最让华佗痛心的是，心爱的姑娘明心惨遭吴思德霸占。在东吴山中，绝望的华佗受隐者指点，幡然醒悟，立志成为医人医心医国的苍生大医。赤壁之战，刮骨疗毒，秘境历险。任凭风吹雨打，从不曾改变拯救苍生的赤子之心。麻沸散的研制成功，也让华佗和明心的爱情修成正果，可就在幸福来临时，曹操因病、因疑、因恨抓走了华佗，这位行医济世、妙手回春的苍生大医逝于囚牢。Click on the green box of "Manaka" (the one-day ticket in the above picture is now updated to the 24-hour subway ticket, see the following subway ticket introduction for details)红椒也笑道：连我刚才要去帮忙，大嫂都说，六弟刚回来，一家子肯定有许多话说，让我只管自己玩呢。