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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).我最近雇了一个女仆。Socks are often used in our life, but you know that the final packaging of socks after production is done manually, which requires workers to pack them by hand in pairs, which takes time and effort. Cui Hai invented a sock packaging machine. As long as the socks are folded and placed on the machine, the process can be completed in two or three seconds, greatly saving time and reducing production cost. (I Love Inventions 20160723 Socks Wear New Clothes)他们汗颜的时候，内心之中对项羽更多的是敬畏。某种程度上，自己虽然也有比较完整的思路和想法，但现在看来似乎并不如蒲俊的仔细。在遥远的北方，曼斯·雷德将各个野人部落团结起来，组建起一支维斯特洛大陆从未见过的庞大军队。只有守夜人军团能够阻挡她入侵七大王国的步伐，但守夜人军团司令率领一支小队北行之后至今未归，没有人知道他们发生了什么事情。狭海的另一端，丹妮莉斯与自己的龙子团聚，她和部从开始寻找新的战船和盟友。