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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).曹无伤凑近了说道：将军，小心有诈，不可不防。其人一直在寻找机遇，有辅佐明主成就功业之志。黄豆心想这么杵着也不是事，得劝啊，于是硬着头皮朝窗户问道：大姐，要不你开门让我们进去坐一坐，好不好？李敬文霍然抬头，对小葱使劲瞪眼，意思叫千万别答应他。/farewell (farewell)拖延数年，移民愈多，荒村无数，纸币泛滥，东南受掠，国库空乏，欠饷之下，逃兵无数。　　层层迷案最终揭露了一场掩盖18年的震撼真相……