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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).青鸾公主仰起苍白的小脸，倔强而又高傲地看着黎章。你刚才说什么，谁要娶你了？板栗小葱急忙挡住他，低声道：别多事了。那这样。故事所讲述的是典型85后的生活方式，他们爱美剧，爱幻想，爱吐槽，爱分享，热爱生活。Advanced Mathematics (3rd Edition of Peking University): I don't read much books on linear algebra. I studied advanced mathematics when I was in school, but it doesn't matter. Just look at the first five chapters. Cooperate with the corresponding video and master the relevant knowledge of matrix and determinant.陕北农村小男孩李天游出生以来从没见过妈妈，奶奶骗他是从月球来的，于是他认为自己是外星人，常常幻想和盼望能遇到飞碟，载他回月球找妈妈。当他看了神舟七号遨游太空的电视转播后，又迫切想成为一名宇航员飞上太空。80后城市女孩美音是某不靠谱摇滚乐队的艺人助理，热爱声音，喜欢录音，在一次乐队穿越黄土高原摇滚之旅的路途中，偶然听到天籁般的信天游，顿时开启了她尘封已久的心灵之窗。隐居荒漠植树防沙的传奇老人白马郎，身怀民歌绝技，原是受人景仰的战斗英雄，他一直在寻找一个可以传承信天游的声音。信天游的歌声仿佛一根神奇的红线，把三个原本毫无关系的人逐渐紧密联系到一起。美音找到歌声的主人了吗？白马郎找到传人了吗？天游最终飞上太空了吗？他找到妈妈了吗？追随着信天游的歌声，超越想象的梦想之旅拉开帷幕，妙趣横生的成长故事娓娓道来。