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One last thing on this subject, The 7.62 mm traced armour-piercing firebombs fired by the 81-1 family, Although the name is a little long, But compared with ordinary munitions, The difference is still well understood: Tracing and burning are simple, Is to add two corresponding drugs, The armor piercing is to replace the steel core behind the bullet's brass back armor (also known as bullet head) with a harder tungsten alloy core with stronger penetration to hard targets. The latter is also the tail-stabilized shelling penetrator used on the third generation of modern main battle tanks (abbreviation: APFSDS) is one of the two main materials (the other is the notorious, highly radioactive depleted uranium penetrator core, The user country is mainly the United States, while China mainly uses tungsten alloy penetrators, Less pollution and better performance, The United States does not need to. First, the United States does not pass the standard of tungsten treatment technology. Far from the level of our country, Secondly, the United States is a tungsten-poor country. It also wants to fully use tungsten alloy bombs, But it can't be used, But as a nuclear Power, There is a lot of depleted uranium as nuclear waste, so depleted uranium is selected as a substitute. As for tungsten alloy and depleted uranium, after putting aside the key additional condition of radioactive pollution, the pure question of who is better in armour-piercing performance is not directly related to this article, so it will not be described in detail).　　和孝公主”出嫁那天，在和珅刻意安排下，永琰的奶娘被杀，死前向永琰透露出他真正的身世…… 永琰不顾乾隆反对，决定前往台湾寻找亲生母亲---那拉皇后。然和珅不肯善罢干休，派遣自己的儿子”丰绅殷德”尾随至台湾，进行暗杀任务……此刻，点将台最高的山石旁，一杆何字大旗正在阳光下随风飞扬、猎猎作响，何霆叉手站立在山石上，肃然注视着校场。天才理工男黄剑（张若昀 饰）与品学兼优的富二代许子聪（李现 饰）为争一个麻省理工学院知名物理学教授招录的名额，而成为明争暗斗的竞争对手。黄剑为达到MIT对社团经验的要求，不得不选择加入奇葩各异的淑媛社，也因此与想要挖掘劲爆素材而隐藏身份混入其中的菜鸟记者朱珠（马思纯 饰）相遇。在共同经历各种“奇葩盛事”后，两人逐渐从“冤家路窄”到“爱意萌动”， 展现“学霸与学渣”间奇特的万有引力，上演了一出笑泪交织的美好热恋。与此同时，其他成员也在这个过程中得到各自的成长。　　【刘青青和老二】23. Skills Competition and Performance Appraisal