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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).Open the Start menu, enter CMD, or use the shortcut key win + R, enter CMD, click Enter, and a command prompt will pop up. Open the directory of projects you are about to create第一次则是在彭纛泽畔，尹旭出手从赵高的褐衣骑士手中救下了他们。两兄弟，一个有前科，另一个是离异的父亲。他们为了应对无法赎回家族农场的窘境，决定联手谋划一连串刺激的盗窃活动。而一位经验丰富的警察开始追踪他们制造的一系列银行抢劫案，决定将他们捉拿归案。No.62 Quan Zhilong刑警队队长高翔每天为工作奔忙着，女朋友姚雪菲身为学者，经常出外考古研究，两人聚少离多，感情也算稳定。但姚雪菲的父母一直反对二人交往。互轻视到相互认可，再到相互理解，逐渐成为知心好友，通过共同调查发现这起案件疑似与十多年的一起盗墓事件有关。渐渐的姚雪菲感觉到了陈朵朵的存在，误会频生，感情面临考验。 　　高翔和陈朵朵负责的案子一波三折，困难重重，看似一切都要真相大白的时候，实际却是更大的陷阱。在排除了众多嫌疑人后，案件陷入僵局。此时姚雪菲发现老师许学文在考古上作假。在许学文为掩人耳目欲至姚雪菲于死地之时，高翔和陈朵朵发现女性被杀案竟与许学文脱不了干系。最终姚雪菲获救，案件终于得以侦破。然而三个年轻人之间的感情归属又将何去何从？? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages: