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4. Having good physical and psychological quality, no infectious diseases and no history of mental illness, and passing the physical examination in hospitals at or above the county level designated by the teacher qualification accreditation institution according to the "Standards and Measures for Physical Examination of Personnel Applying for Accreditation of Teachers' Qualification".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).敬文娘拉着儿子手道：娘依你。先只是小火，所以没人发现，这会儿才烧旺起来。Telecommunications你小叔不忍，就去看她……后来她就病死了。离家多年、独自生活的平井，不得不在个人理想和家庭责任之间做出抉择；