Laser Technology to be Used to Warn Straying Pilots 用激光技术为迷航的飞行员示警 In September 2004, a Delta pilot claimed a laser beam injured him as he was about to land his jet in Salt

发表于:2018-12-08 / 阅读(76) / 评论(0) 分类 VOA2005(上)--环境科学探索