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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).《远古入侵》是由Impossible Pictures公司为英国ITV电视台制作的重头电视科幻剧集。第一部中Nick Cutter教授和他的团队在Dean森林他们调查时间异常情况。同时远古时代的恐龙也通过异常点来到了现在的地球，给小组的调查带来了更多压力和挑战。Cutter教授与其失踪8年的妻子Helen穿过异常点，来到了远古时期，回来后世界发生了无法挽回的剧变。而他与Helen则是唯一知道真相的人...第三部开篇，一只锯鳄穿过异常点走上了伦敦街头。Cutter, Abby, Connor和小组的新成员Becker上尉与博物馆美艳的考古学家Sarah Page联手，试图在锯鳄造成更多伤亡之前捕获它。在这一季中，Cutter和同伴不仅要面对史前猛兽，还有可怕的未来生物，以及在其背后隐藏的真相。。。而独行侠般的警官Danny Quinn将加入小组。本片是土耳其史上最贵的影片，制作成本达到1700万美元。于是火炮不紧不慢架好，填弹上药，瞄准。徐风揉着脑袋呲牙利嘴。谢逊道：不错。可是实际情况呢？子夜还是偷偷溜去了彭城，虽然事后及时发现，派人前去暗中保护，却终究是晚了一步。