1998年,国外在战斗机、无人机、机载武器等空军武器装备方面都取得了新进展,在高超音速飞机技术研究方面也有新的发展。一、战斗机美国防部4月宣布,把F-22战斗机小批量生产开始日期从1998年12月推后一年。空军购买2架F-22飞机进行飞行试验,到11月下旬,已按计划完成183小时... In 1998, foreign countries made new progress in the field of air force weapons and equipment such as fighter planes, unmanned aerial vehicles and airborne weapons. New developments have also been made in the research of hypersonic aircraft technology. First, the fighter United States Department of Defense announced in April, the F-22 fighter low-volume production start date from December 1998 pushed back one year. Air Force to buy two F-22 aircraft for flight test, to late November, has been completed as planned 183 hours ...