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按国际惯例,目前战斗机分代原则主要有三条：一、各国战斗机分代标准应该是统一的,应该以技术水平最先进的国家的典型战斗机为“标杆”,确立分代的标准。二、各代战斗机的主要技术水平要有“台阶性”的提高,即“小改小革”不能算“改朝换代”。三、“换代飞机”必须是一个时期的主力机种,即“标杆”飞机不仅要有质,还要有量,特别要经过实战考验。一些研究性、验证性飞机性能再好,也不能看作“换代飞机”。根据这三条原则,至今现代战斗机可分为四代。十分有趣的是,战斗机的更新史也是军事大国的一部竞争史。
According to international conventions, there are basically three principles for the classification of fighter jets at present: First, the standards of generational fighters in various countries should be unified. Typical fighters in countries with the most advanced technological standards should be regarded as “benchmarking standards” to establish the standards of generational generation. Second, the major technological levels of fighters in all generations should be “step-by-step” improvement, that is, “small change small leather” can not be “changed dynasty.” Third, the “replacement aircraft” must be the main model for a period of time. That is to say, the “benchmark” aircraft should not only have quality but also quantity, in particular, be tested in actual combat. Some research, verification of the aircraft no matter how good, nor as “a replacement aircraft.” According to these three principles, modern fighter jets can be divided into four generations. It is very interesting that the update history of fighter jets is also a history of competition among the military powers.