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The outer surface is plated with oxygen-free copper, and the raw materials of the core wire are brass, bronze and miscellaneous copper. Because the raw materials of copper inside and outside are different, it is called copper clad copper. The quotation is moderate, and the quotation for miscellaneous copper is usually only half or lower than that for oxygen-free copper. The produced wire is attributed to non-standard wire, and its anti-twisting and anti-oxidation functions are better than those of copper-clad aluminum. Suitable for induction and wiring engineering with low accounting, it can lay hidden lines in the wall. However, due to the influence of raw materials, the resistance is relatively large, with a 100-meter resistance of 25-35 ohms or even more, and the signal attenuation is very large. It is not so-called all-copper. We pay attention to the distinction.1949年，甘肃天水城外，两军对垒，杀声震天。英雄营长耿震山亲率一连战士经过惨烈的厮杀战，突出重围，奋力阻击敌人军用列车的通过。面对呼啸而来的庞然大物，战士们束手无策，情急之下，耿震山不得以下令炸毁隧道。铁路畅通是解放兰州的必须条件，耿震山炸毁隧道，犯下重罪，险些被枪毙。团长陈坤命令耿震山限期修通隧道，戴罪立功。错了，错了。　　父亲带着两个儿子去俄罗斯北部的小岛度假，一路上他们遇到各种困难， 父亲皆能轻松解决，然而父子间的距离却始终没有拉近。他对待儿子们格外严厉，大儿子安德列对此只能小心应付，小儿子伊万却桀骜不驯。这次旅行，是否能成为父子间的疗伤之旅呢？为这，下官还挨了表弟好一顿骂呢。