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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).Fire doors and　　1991年，ATV亚洲电视台根据小说《天蚕再变》拍摄电视连续剧《天蚕变之再与天比高》。 历经十二年的沉浮起落，天蚕变系列终于随着主人公云飞扬一生坎坷命运的完结而画上句点。这清甜的豆浆，加那个咸菜，你说说。该片讲述了男女主角被卷入一个巨大的科研阴谋，在一步步揭露谜团的过程中，两人不得不面对爱情、欺骗、阴谋、背叛等，在以为已经窥视到阴谋的全貌时，却又发现，这一切只是冰山一角……小葱也奇怪起来，转头望向另一处洞室，那边是库房：这是……有人偷花生？板栗摇头道：往哪偷？这里面又不得出去。理查德·哈蒙德主持的《理查德·哈蒙德：看不见的世界》带领我们超出人眼视觉极限的平行宇宙世界，本片利用顶尖科技来探索极限以外的世界。